Final answer:
Hamlet's character in the excerpt is complex because his erratic behavior confuses his friend.
Step-by-step explanation:
In the excerpt from Act III of Hamlet, Hamlet's character is complex because his erratic behavior confuses his friend. Rosencrantz, concerned about Hamlet's state of mind, questions the cause of his distemper. Hamlet responds with a mix of wit, sarcasm, and self-deprecating humor, making it difficult for Rosencrantz to understand Hamlet's true emotions and motivations.