Complex sentence: Edward was supported by Dafydd ap Gruffydd and Gruffydd ap Gwenwynwyn, and many of the lesser Welsh princes who had supported Llywelyn now hastened to make peace with Edward.
Split into simpler sentences: Edward was supported by Dafydd ap Gruffydd and Gruffydd ap Gwenwynwyn. Many of the lesser Welsh princes who had supported Llywelyn now hastened to make peace with Edward.