Which of the following sentences is a complex sentence?

Which of the following sentences is a complex sentence?

My other goals are just as important.

I dreamed of going to college, but my dance career was my first choice.

While I suggest that everyone should set goals, sometimes you have to be willing to adjust them as you go.

Dancing is the one activity that doesn’t make me frustrated.

The sentence "I dreamed of going to college, but my dance career was my first choice." is a complex sentence.