Complex sentence: The earlier SIMD instruction sets on the x86 platform, from oldest to newest, are MMX, 3DNow! (developed by AMD), SSE, SSE2, and SSE3.
Split into simpler sentences: The earlier SIMD instruction sets on the x86 platform, from oldest to newest, are MMX, 3DNow! (developed by AMD), 3DNOW! Professional, SSE, SSE2, and SSE3.