The plot was quite complex.

Meaning

The story was complicated and difficult to follow.

Examples

• John: Did you enjoy the movie?
• Alice: It was alright, but <b>the plot was quite complex</b>. I had trouble keeping up.
• John: Yes, I agree. I found <b>the plot was quite complex</b> and hard to understand at times.
• Alice: Maybe we should read a summary.