Complex sentence: SSE2, Streaming "Single Instruction, Multiple Data" Extensions 2, is one of the IA-32 SIMD instruction sets, first introduced by Intel with the initial version of the Pentium 4 in 2001.
Split into simpler sentences: SSE2, Streaming "Single Instruction, Multiple Data" Extensions 2, is one of the IA-32 SIMD instruction sets. SSE2 was first introduced by Intel with the initial version of the Pentium 4 in 2001.