Complex sentence: In 1946, she was jailed for her nationalistic activities and after she came out of prison she became one of the first members of Netaji Shubhash Chandra Bose's Forward Bloc.
Split into simpler sentences: In 1946, she was jailed for her nationalistic activities. After she was released from prison she became one of the first members of Netaji Shubhash Chandra Bose's Forward Bloc.