Surprisingly tTo many people who never eat, most offal, such as pig stomach, intestine, and kidney, etc., it is surprising that they are relatively more expensive than meat and ribs.

However, I read a piece of news that in some regions in South America, some people who don't eat these products changve started to eat them, and I don't know the exact reason.

Surprisingly to many people who never eIt may surprise people who do not eat it to learn that, most offal, such as pig stomach, intestines, and kidney, etc., they are relativelyis more expensive than meat and ribother meats.

When you include "etc" it means the list goes on, so don't include an "and" before the "etc." Ribs are considered a type of meat cut, so it does not have to be mentioned separately.

In some inland regions inof China, at the end of every year, the price of these products would surgesurges at the end of the year before the Spring Festival, also calledknown as the traditional Chinese New Year.

Price is singular so the correct verb is "surges." It is easier to follow the flow of the sentence when the references to time (at the end of the year and before the spring festival) are grouped together within the sentence.

However, I read a piece of newsI read a news article that in some regions inof South America, some people who don't eat these products changed to eat them, and I don't know the exact reasonpreviously didn't eat offal have started eating it, but I don't know why that is the case.

The correct phrase is "regions OF China" and "regions OF South America" not "regions IN South America." The sentence needs to be in the past tense.

Surprisingly toTo the surprise of many people who have never eaten it, most offal, such as pig stomach, intestine, and kidney, etc., they are relativelyare more expensive than meat and ribs.

"etc." means "and so on". Hence, the "and" is a little awkward, because if you spelt out the sentence in full, it would read "pig stomach, intestine, and kidney, and so on". Notice the redundant repetition of "and".

The "they" is ungrammatical, because the subject has already been introduced prior ("most offal").

The "relatively" is redundant, because "more expensive than meat and ribs" already implies comparison.

However, I read a piece of news that in some regions in South America, some people who doidn't eat these products chang(previously) have started to eat them, andbut I don't know the exact reason.

Surprisingly to many people who have never eat,en most offal, such as pig stomach, intestine, and kidney, etc., they are relatively more expensive than meat and ribs.

However, I read a piece of news that in some regions in South America, some people who don't eat these products have changed and started to eat them, andbut I don't know the exact reason.