Original sentence: His first compression product was released in the mid-1980s with a program called PKARC.Katz had a special flair for optimizing code.PKARC was compatible with the then-popular ARC program written by Thom Henderson, founder of SEA System Enhancement Associates
Edited sentence: At the time, he had worked on an alternative to Thom Henderson's ARC, named PKARC.Following his graduation, Phil Katz was hired by Allen-Bradley Co.He wrote code to run "programmable logic controllers," which operate manufacturing equipment on shop floors worldwide for Allen-Bradley's customers.Katz left Graysoft in 1987 to found PKWARE, with Steve Burg, a former Graysoft programmer joining the company in 1988.Phil Katz  had a special flair for optimizing code.Phil Katz left Allen-Bradley in 1986 to work for Graysoft, a Milwaukee-based software company.as programmer