Is This a Complex Sentence

My friend is playing soccer.

• complex sentence

• NOT a complex sentence

After the movie, we all went out for a pizza.

• complex sentence

• NOT a complex sentence

We ran home and ate dinner.

• complex sentence

• NOT a complex sentence

Unless he shows, we have to close up the shop.

• complex sentence

• NOT a complex sentence

She had a fun birthday party.

• complex sentence

• NOT a complex sentence

Wherever they are, it is far from here.

• complex sentence

• NOT a complex sentence

As I arrived, they all go out of the car.

• complex sentence

• NOT a complex sentence

We didn't hear the sound.

• complex sentence

• NOT a complex sentence

Although she was smart, she didn't understand the problem.

• complex sentence

• NOT a complex sentence

I love to read.

• complex sentence

• NOT a complex sentence