Polonius’s character is complex in the excerpt because

The character of Polonius is complex because he practices deception in the Act III of Hamlet.

Explanation:

In the Act III of Hamlet, the character of Polonius is shown as a deceptive character. The proof for this is given in the excerpt. There was a deal made between Polonius and Claudius. According to this deal, Polonius was going to hide in the chamber of Gertrude. The reason for this hiding is that he wanted to hear the conversation between Hamlet and his mother and this can be done only by hiding himself.

Along with this of hearing the conversation by hiding himself in the chamber, he also wanted to convince Gertrude that Gertrude should not be so partial towards Hamlet . This made him have a deceptive character in the act and because of this he is said to have a character which is complex in the Act of Hamlet.