Complex sentence: He carried on the struggle for several months, but in June 1283 was captured in the uplands above Abergwyngregyn at Bera Mountain, together with his family, brought before Edward, then taken to Shrewsbury where a special session of Parliament condemned him to death.
Split into simpler sentences: He carried on the struggle for several months, but in June 1283 was captured in the uplands above Abergwyngregyn at Bera Mountain together with his family. He was brought before Edward, then taken to Shrewsbury where a special session of Parliament condemned him to death.