Complex sentence: Arriving at Wessagusset, Standish found that many of the Englishmen had gone to live with the Massachusetts, and he ordered them to be called back to Wessagusset.
Split into simpler sentences: Arriving at Wessagusset, Standish found that many of the Englishmen had gone to live with the Massachusett. Standish ordered them to be called back to Wessagusset.