Complex sentence: Te Wherowhero agreed and in June 1858 he was anointed at Ngaruawahia, adopting the name Pōtatau te Wherowhero or simply Pōtatau.
Split into simpler sentences: Te Wherowhero agreed and in June 1858 he was anointed at Ngaruawahia. He became known as Pōtatau te Wherowhero or simply Pōtatau.