Complex sentence: On 1 July 1902 the IMR became the Central South African Railways (CSAR) and the forty locomotives therefore came onto the CSAR roster, where they were designated Class 8-L1.
Split into simpler sentences: On 1 July 1902, the IMR became the Central South African Railways (CSAR). These forty 8th Class locomotives therefore came onto the CSAR roster, where they were designated Class 8-L1.