Complex sentence: From September 2003 to February 2006, Sophos served as the parent company of ActiveState, a developer of programming tools for dynamic programming languages: in February 2006, ActiveState became an independent company when it was sold to Vancouver-based venture capitalist firm Pender Financial.
Split into simpler sentences: From September 2003 to February 2006, Sophos served as the parent company of ActiveState, a developer of programming tools for dynamic programming languages. In February 2006, ActiveState became an independent company when it was sold to Vancouver-based venture capitalist firm Pender Financial.