Complex sentence: It is the first railway station of South India, and the first train of South India started operating in June 1856 from Royapuram station, it also remained the headquarters of the Madras and Southern Mahratta Railway till 1922, till it moved to Egmore.
Split into simpler sentences: It is the first railway station of South India, and the first train of South India started operating in June 1856 from Royapuram railway station. The station also remained the headquarters of the Madras and Southern Mahratta Railway till 1922, when the headquarters was shifted to Egmore.