The effects of living in a big city

Big cities have a lot of positive effects on people's lives. One effect ("One effect..." is OK but I think "One positive..." sounds better) is that people can receive a high quality education. If you live in a big city you can go to many schools, for example you can go to an art school, music school, theater school, or opera school. Secondly, when people are ill, they have the benefit of the best health services. In addition, when people want go to the hospital, they can choose from many different a lot of hospitals. Another effect (again "positive" or even "postive effect" sounds better) is that people can use a lot of different types of transportation, like for example, a bus, taxi, subway, train, tram, or steamboat. To sum it all up, despite the fact that big cities are very crowded, the advantages are far more valuable than the disadvantages.

**For your last sentence I would've said, "To sum it all up, despite the fact that big cities are very crowded, the advantages of living in a city far outweigh the disdvantages." Good job and good luck!