Complex sentence: The North Borneo dispute refers to the territorial dispute between Malaysia and the Republic of the Philippines over much of the eastern part of the state of Sabah, a territory known as North Borneo prior to the formation of the Malaysian federation.
Split into simpler sentences: The North Borneo dispute refers to the territorial dispute between Malaysia and the Republic of the Philippines over much of the eastern part of Sabah. Sabah was known as North Borneo prior to the formation of the Malaysian federation.