Complex sentence: It was mistakenly posted in the Herald Sun that he is of Samoan heritage, which they had a mix-up between Sika & team mate Jeremy Smith who was said to be of Tongan heritage.
Split into simpler sentences: It was mistakenly posted in the Heraldsun that he is of Samoan heritage. Which they had a mix-up between Sika & team mate Jeremy Smith who was said to be of Tongan heritage.