Complex sentence: UI had many of the same characteristics of OSF with the exception of a software development staff-UNIX System Laboratories (USL) filled the software development role-and thus UI was based in Parsippany, New Jersey to be close to USL.
Split into simpler sentences: UI had many of the same characteristics of OSF with the exception of a software development staff. Unix System Laboratories (USL) filled the software development role and UI was based in Parsippany, New Jersey to be close to USL.