Which is a simple sentence?

 - During last night's game, the tall, lanky girl easily spiked the volleyball over the net and blocked all the other team's hits.
 - I can review the draft of your story unless you're still editing it.
The second sentence is the simple sentence. It is a single independent clause.
During last night's game, the tall, lanky girl easily spiked the volleyball over the net and blocked all the other team's hits.