Complex sentence: The PA-8000 (PCX-U), code-named "Onyx", is a microprocessor developed and fabricated by Hewlett-Packard (HP) that implemented the PA-RISC 2.0 instruction set architecture (ISA).
Split into simpler sentences: The PA-8000 (PCX-U), code-named "Onyx", is a microprocessor developed and fabricated by Hewlett-Packard (HP). It was an implementation of the PA-RISC 2.0 instruction set architecture (ISA).