Complex sentence: FFS2 is a minor update of FastFileSystem for AmigaOS4 and MorphOS; it implements long filename support whilst maintaining backward compatibility with the older FastFileSystem and OldFileSystem.
Split into simpler sentences: FFS2 is a minor update of FastFileSystem for AmigaOS4 and MorphOS. It implements long filename support while maintaining backward compatibility with the older FastFileSystem and OldFileSystem.