Complex sentence: Following Swein's death in 1014 Aethelred was able to return home, however, Swein's son, Cnut the Great, contested Æthelred's return.
Split into simpler sentences: Following Swein's death in 1014, Aethelred was able to return home. However, Swein's son, Cnut the Great, contested Æthelred's return.