Complex sentence: It is disputed whether it was only Hamza ibn Abd al-Muttalib or only Abu Talib or both uncles who accompanied Muhammad on this errand. Khadija's uncle accepted the proposal, and the marriage took place.
Split into simpler sentences: It is disputed whether it was only Hamzah bin'Abdul-Muttalib or only Abu Talib or both uncles who accompanied Muhammad on this errand. Khadijah's uncle accepted the proposal, and the marriage took place.