Complex sentence: Kamal Kumar was married to Dayamayee Majumdar and his younger brother was a renowned painter, Nirode Mazumdar, their younger sister Shanu Lahiri (1928-2013) was also a noted painter and art educator.
Split into simpler sentences: Kamal Kumar was married to Dayamayee Majumdar and his younger brother was a renowned painter, Nirode Mazumdar. Their younger sister Shanu Lahiri (1928--2013) was also a noted painter and art educator.