Complex sentence: In 1997, with his son Orion, he founded BigFix Inc, an IT software patching system (which they sold to IBM for $400 million in 2010) and in 2007, the pair founded the cybersecurity firm, Tanium.
Split into simpler sentences: In 1997, he founded BigFix Inc, an IT software patching system (which they sold to IBM for $400 million in 2010). In 2007, along with his son, Orion, he founded the cybersecurity firm, Tanium.