Complex sentence: DESQview was not a full-fledged GUI operating system; it was a quasi-GUI shell that ran in real mode on top of DOS, although it could run on any Intel 8086-or Intel 80286-based PC.
Split into simpler sentences: DESQview was not a full-fledged GUI operating system; it was a quasi-GUI shell that ran in real mode on top of DOS. Although it could run on any Intel 8086-or Intel 80286-based PC.