Complex sentence: Mnuchin's mother was a longtime investor with Bernie Madoff, after his mother died in early 2005, Mnuchin and his brother liquidated her investments, making $3.2 million.
Split into simpler sentences: Mnuchin's mother was a longtime investor with Bernie Madoff. After his mother died in early 2005, Mnuchin and his brother liquidated her investments, making $3.2 million.