Complex sentence: Until the 8th century, the Síl nÁedo Sláine (also known as the kingdom of Brega) was pre-eminent, but from 728 the western dynasty of Clann Cholmáin was dominant.
Split into simpler sentences: Until the 8th century, the Síl nÁedo Sláine (also known as the kingdom of Brega) was pre-eminent. From 728 the western dynasty of Clann Cholmáin was dominant.