Complex sentence: On 22 July 1963, Sarawak was granted self-government by the British and subsequently became one of the founding members of the Federation of Malaysia, established on 16 September 1963.
Split into simpler sentences: On 22 July 1963, Sarawak was granted self-government by the British. Following this, it became one of the founding members of the Federation of Malaysia, established on 16 September 1963.