Complex sentence: FullPaint was one of the first programs to really differentiate itself from MacPaint, and made the company fairly successful and the company opened a sales office and changed their official address to Newbury Park, CA.
Split into simpler sentences: FullPaint was one of the first programs to really differentiate itself from MacPaint, and it made the company fairly successful. The company opened a sales office and changed their official address to Newbury Park, CA.