Change around the structure of some of your sentences and it might sound smoother? like the last one might sound better as “Due to the ash preserving everything we have learned so much about the Roman lifestyle.” which is definitely preference, but maybe since it ends more on your topic than a point it sounds smooth. also just adding transition words between sentences can help!
Maybe if you try to add transitioning words like then finally therefore but and so but i think you should fix the last sentence and combine it to the sentence before to Pompeii was an important city to Rome because it was a major trading area therefore we have learned so much about the Roman lifestyle and life during the eruption due to the ash preserving everything and consuming it all.
