Complex sentence: English was the President of Boston Light Software, an ecommerce company he co-founded in Arlington, Massachusetts in 1998 and sold to Intuit in 1999, where English became Intuit's Vice President of Technology.
Split into simpler sentences: English was the President of Boston Light Software (BLS), an ecommerce company he co-founded in Arlington, Massachusetts in 1998. BLS was sold to Intuit in 1999, where English became Intuit's Vice President of Technology.