Complex sentence: He came across a company called NexGen, a boutique processor design Co. that was eight years old; and joined the Co. as COO.Nexgen was the only Co. that was developing Intel compatible microprocessors at the time.
Split into simpler sentences: He came across a company called NexGen, a boutique processor design company that was eight years old, and joined it as COO. NexGen was the only company that was developing Intel compatible microprocessors at the time.