Complex sentence: The PDP-6 was DEC's first "big" machine, based on a 36-bit word length common with other business machines from companies like IBM, Honeywell and General Electric.
Split into simpler sentences: The PDP-6 was DEC's first "big" machine. It used 36-bit words, in common with other large computers at the time from companies like IBM, Honeywell and General Electric.