Complex sentence: At first, Buck was a charming person until over time, he started to display raged tempers, even taking them out on Tracey, and even telling her on how Buck's mother used to abuse him when he was a child.
Split into simpler sentences: At first, Buck was a charming person, until, over time, he started to display raging tempers. He took them out on Tracey, telling her all about how Buck's mother used to abuse him when he was a child.