Complex sentence: In 2011, VinSolutions was sold for $135 million to AutoTrader.com then Watson founded Stackify in January 2012 to assist software developers in troubleshooting and support with a suite of tools including Prefix and Retrace.
Split into simpler sentences: In 2011, VinSolutions was sold for $135 million to AutoTrader.com. Then Watson founded Stackify in January 2012 to assist software developers in troubleshooting and support with a suite of tools including Prefix and Retrace.