Complex sentence: Sharmila Tagore, a well-known Mumbai actress, belongs to this family but it is not known to which branch of the family, her son Saif Ali Khan is also a well-known actor.
Split into simpler sentences: Sharmila Tagore, a well-known Mumbai actress, belongs to this family but it is not known to which branch of the family. Her son Saif Ali Khan is also a well-known actor.