Complex sentence: Marathwada, Telangana and 4 districts of Karnataka were part of former princely Hyderabad state, since 1948 when Hyderabad state became part of India, 17 September has been celebrated as "Liberation day" by Government of Maharashtra and Government of Karnataka.
Split into simpler sentences: Marathwada, Telangana and 4 districts of Karnataka were part of former princely Hyderabad state. Since 1948 when Hyderabad state became part of India, 17 September has been celebrated as "Liberation day" by Government of Maharashtra and Government of Karnataka.