In the last two years the tourism data in Utrera has experienced a huge decrease as a consequence of the improvement of several facilities and leisure areas in the city of Seville.

I think your use of the phrase "tourism data" here is correct but sounds a bit unnatural
If you want to talk about the data you could say "In the last two years, data shows that Utrera has experienced a huge decrease in tourism"

Therefore, with the aim of recovery our previous position for tourists, it has been recently built a new shopping a new shopping centre has been built recentrely , which far from being suitable for most of citizens, it has been a topicn especially controversial. topic

Your sentence makes sense but the word order sounded a bit disjointed and unnatural

you could also say "recently, a new shopping centre has been built"

However, there is a long list of indirect effects both into people's health and nature.

This sentence makes sense btu it might sound more natural to say "to people's health" rather than "in" it
you could also say "for people's health" and this would make sense too.
also, if the nature you mean is like trees and the outdoors you might want to say "both to people's health and to nature", using the extra "to" before nature to clarify that the nature does not belong to the people. (because a person's nature has a different meaning as it could mean their personality or ethics)

This is a small city and people weare used to a quieter way of life.

"used to" here is more of an adjective because it describes how the people are, so even though it looks like it would be past tense, "are" makes more sense than "were" here because you said the city "is" small, which is present tense so you should stay in the same tense rather than switch to the past tense "were"

As rRegardsing the environment, the main problem is the same, since noise affects the behaviour and growth of a lots of different species, especially birds, from the national park located 20 km away from Utrera, in the north of Seville.

There have been never been so many tourists here before, which has allowed the opening of several new shops and restaurants, which in turn means more jobs.

There was not a mandatory issue to build noise barriers along the highway that connect with the mall, since noise's law islaws about noise are pretty soft in this city.

Nevertheless, this works must be done in order to avoid future European sanctions in environmental issues.

"this" is usually used before a singular or collective noun suggesting one unit of thing
example: "this cat" "this group of boys"
if you are talking about several "works" you could say "these works" as "these" is the plural form of this
example: "these cats" "these boys"