Complex sentence: The term'IBM PC compatible' is not commonly used today because all current mainstream computers are based on the PC architecture, and IBM no longer makes PCs. The competing platforms have either died off or been relegated to niche, enthusiast markets like the Amiga.
Split into simpler sentences: The term'IBM PC compatible' is not commonly used for current computers because all the mainstream computers are based on the PC architecture. Most competing platforms have either died off or been relegated to niche, enthusiast markets like the Amiga.