Complex sentence: Apple Computer started producing Power Macs in 1994; earlier models were based on 68k-series processors, and the Mac OS operating system released with the new machines included an emulator to enable programs written for the older machines to run without changes.
Split into simpler sentences: Apple Computer started producing Power Macs in 1994; earlier models were based on 68k-series processors. The ROM and Mac OS operating system released with the new machines included an emulator to enable programs written for the older machines to run without changes.