The diagram illustrates how plastic bottles are recycled in the morden society.

1. Since you are tasked to summarize the information, this sentence is totally unnecessary.
2. There is no "the" in "In society, in modern society.

There are eight main stages ofin the recycling process from the initial part of waste bottled to the final products like, which turns waste bottles into clothes, pencils, paper bags, and bottles.

1. You use "stages of the recycling process" when you talk about the stages themselves, eg: "The eights stages of the recycling process are..." Here, you talk about the stages as a while and so you use "in".
2. You can use a relative clause to explain what the process does.

We can see that waste bottles are left in the trash by people will becollected and transported to thea recycling center by trucks, where they will be sorted by worker and workers sort bottles according to their types.

1. The word "waste" already means that they are trash. The only meaningful words from "we can... by people" are "waste bottles".
2. From [1] to [2], the action is "to collect".
3. Since there are likely multiple recycling centers and you are not talking about a specific one, write "a recycling center."
** Check whether you are expected to write in British or American English. Your sheet is written in British English. In that case, write "centre".
4. The first "they" refers to bottles, but there are two nouns (people and trucks) that are also in plural. Even though one can assume that "they" means "bottles", grammatically your sentence is ambiguous. Likewise, the "their" refers to "they" ("bottles") and not workers.
4b. If you change the second phrase to active voice, you can avoid the issue with references.

Next, the sorted bottles will be compressed into blocks.

Since you are now talking about specific bottles, you need to add "the".

After being crushed, the bottles will becomewards, the plastic shards andwill be washed in a tank.

1. Contextually, what is crushed is plastic blocks, not plastic bottles (the deferred subject). You can avoid the issue by using "afterwards".
2. Your original sentence can be broken down as "The bottles will become shards" and "the bottle will be washed". It is unclear why you keep the subject the same. It is the shards that are being washed, and bottles exist no more after going through the crushing machine.

At the sixth stage, they will putWorkers then put the shards into a machine whichto produce plastic pellets.

1. It is very awkward for you to mention the sixth stage since you have not been counting all along.
2. "They" does not have a reference. Use "workers".
3. Put <something> into a machine. Use "shards".
4. It sounds more natural to talk about the process "put <X> into a machine to produce <Y>" as the output is what feeds into the next step. The relative clause focuses on the capability of the machine.

At the end of theThe final process ,is to heating the pellets will be made to form raw materials, which can produce the final products like clothes, pencils, paper bags, and bottlebe turned into final products.

1. [8] is not the final process; it produces raw materials only.
2. "Will be made to form": Since you are given the verb "to heat", use it. "Heat the pellets to..."
3. "Which can produce": Plastic is incapable of producing anything.
4. You should not repeat the list of final products as you have talked about them in the first sentence.

Then, the bottles will be put into anotherse newly produced plastic bottles will become waste one day and can go through the recycleing process over again.

1. The bottles should become waste first before they will go back into the recycling process. Therefore, you should not write "then" as that is not going to happen immediately.
2. "Another" is the wrong word here as the plastic will go through the very same process. You should use "again".

The diagram illustrates how plastic bottles are recycled in the mordern society.

There are eight main stages of the recycling process from the initial partstarting from the first stage of waste bottleds to the final products like clothes, pencils, paper bags, and bottles.

it's a bit awkward to say "initial part”. It is more common to use first stage, initial stage or you can simply mention starting from waste bottles to the final finished products ...etc. Instead of using the word 'like' , you can also use 'such as' , 'for example' etc.

We can see that the waste bottles which are left in the trash by people will be transported to the recycling center by trucks, where they will be sorted by workers according to their types.

Next,After that, the sorted bottles will be compressed into blocks.

a more sophisticated word for ‘next' : Subsequently, Consequently,

After being crushed, the bottles will become shards and will be washed in a tank.

At the end of the process , theating pellets will be maheated in order to formmake raw materials, which can produce the final products likesuch as clothes, pencils, paper bags, and bottles.

ThenFinally, the bottles will be put into anogo through ther recycleing process all over again.