Complex sentence: As of 2002 about 20 percent of Credit Suisse's revenue was from its insurance arm through its 1997 acquisition of Winterthus of April 2012, the bank had a $3.7 billion portfolio of catastrophe insurance funds.
Split into simpler sentences: As of 2002 about 20 percent of Credit Suisse's revenue was from its insurance arm through its 1997 acquisition of Winterthus. In April 2012, the bank had a $3.7 billion portfolio of catastrophe insurance funds.