Which sentence is a complex sentence?

Question

Responses

The musician who has an amazing voice is performing tonight.
The musician who has an amazing voice is performing tonight.

The musician has an amazing voice, and it is the main reason I like him.
The musician has an amazing voice, and it is the main reason I like him.

The musician has an amazing voice.
The musician has an amazing voice.

I like the musician, and he has an amazing voice.

Answer 1

The complex sentence among the options is:

The musician who has an amazing voice is performing tonight.

This sentence contains a main clause ("The musician is performing tonight") and a relative clause ("who has an amazing voice"), which makes it complex.