Question

Which is a complex sentence?

a. The technician installed my hard drive and turned on my computer.
b. After you install the security software, your computer will run smoothly.
c. My computer is lightweight, powerful, and portable.
d. Both computers are powerful, but this one is less expensive.

Answer 1

The answer to your question would be that "after you install the security software, your computer will run smoothly" is a complex sentence.

Step-by-step explanation:

A complex sentence has at least one dependent clause (a) and one independent clause (b). The difference between a dependent and independent clause is that the latter can stand alone as a sentence as it represents a complete thought.

a) *After you install the security software,

b) your computer will run smoothly.

Answer 2

A complex sentence is a sentence which has one independent clause  and with at least one dependent clause. From the choices given, the best answer is B. The independent clause would be "your computer will run smoothly" and the dependent clause would be "you install the security software".