Complex sentence: Gurling's grandfather, Richard Gurling Senior, was also a rebel and had been Powell's accomplice in the 1684 case with the interloper and the two men appear to have been friends and allies.
Split into simpler sentences: Gurling's grandfather, Richard Gurling Senior, was also a rebel and had been Powell's accomplice in the 1684 case with the interloper. The two men appear to have been friends and allies.