Complex sentence: The sovereignty of the Chagos Archipelago is being disputed between the UK and Mauritius, the Archipelago was split from the Territories of Mauritius prior to Mauritian independence in 1968.
Split into simpler sentences: The sovereignty of the Chagos Archipelago is being disputed between the UK and Mauritius. The archipelago was split from the Territories of Mauritius prior to Mauritian independence in 1968.