Complex sentence: The DOS device driver of DriveSpace 3 had a memory footprint of around 150 KB because of all these new features causing difficulty for users rebooting into the MS-DOS mode of Windows 95 for running games, because of the reduced amount of conventional memory available.
Split into simpler sentences: The DOS device driver of DriveSpace 3 had a memory footprint of around 150 KB because of all these new features. This caused difficulty for users rebooting into the MS-DOS mode of Windows 95 for running games, because of the reduced amount of conventional memory available.