Which of these is a complex sentence?

Immigrants who came to work in factories lived in urban neighborhoods.

"Old" immigrants often settled on farms, but most "new" ones lived in cities.

In the past, many immigrants had come from northern and western Europe.

Immigrants working long hours and facing crowded living conditions.

hhebeueubevcje. he. me. e beben

we have pictures for proff

they also have books

the united states began searching for a way to reduce oil

-agarvated

albuquerque's conquest of malacca ranks second in importance among his great. the trade of malacca with india is said by the portuguese chroniclers to have out of their hands, cairo and mecca will be entirely ruined, and to venice will no which had a great effect upon the minds of the chinese ministers