Complex sentence: His rival, Niels's son Magnus, seems to have hated and feared him and January 7,1131, he trapped Canute in the forest of Haraldsted at Ringsted in Zealand and had him murdered.
Split into simpler sentences: His rival, Niels's son Magnus, seems to have hated and feared him. On January 7,1131, Magnus trapped Canute in the forest of Haraldsted in Ringsted in Zealand where had him murdered.