What makes up a complex sentence?

Which major world event was near the birth of the modernist movement

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.

Which poems include the theme that memories of beautiful natural places benefit the people who recall them? "to spring" and "lines written in early spring" "to autumn" and "to a butterfly" "to summer" and "the human seasons" "i wandered lonely as a cloud" and "lines on a beautiful spring in a village"