Which is a complex sentence?

after you install the security software, your computer will run smoothly.

the technician installed my hard drive and turned on my computer.

my computer is lightweight, powerful, and portable.

both computers are powerful, but this one is less expensive.

both computers are powerful, but this one is less expensive.

I'm not 100% sure but I think this is the right answer. Hope this helps!

the tone of the passage is sympathetic to the forbidden love of romeo and juliet. the nurse plays a significant role in the play. she is responsible for making their meeting again possible. additionally, there is a sense of warning in the choice of words of the nurse. she seems to be authoritative when she calls romeo "scurvy knave", and at the same time the fact that she addresses to him as "sir" reflects respect. the nurse is "vexed", this word describes her confused state of mind. on the one hand, she finds romeo a fine and eloquent man, but on the other, it is thought that man's nature forces men to try to trick women.