Complex sentence: In the mid- 1980s, a another key Compact employee, William Child, left and with Chuck Abronson founded EEsof, offering a new program, TouchStone, written for the IBM PC.
Split into simpler sentences: In the mid- 1980s, another key Compact employee, William Child, teamed up with Chuck Abronson. They fonded a new software company EEsof, with a new program, TouchStone, that was written for the IBM PC.