Complex sentence: Ealdred was an advisor to King Edward the Confessor, and was often involved in the royal government, as well as a military leader, for in 1046 he led an unsuccessful expedition against the Welsh.
Split into simpler sentences: Ealdred was an advisor to King Edward the Confessor, and was often involved in the royal government. He was also a military leader, and in 1046 he led an unsuccessful expedition against the Welsh.