Complex sentence: Bheem and Hidimb's sister, Hidimba, then got married and had a son, Ghatotkacha, (who later proved to be a great warrior in the war against Kauravas).
Split into simpler sentences: Bheem and Hidimb's sister, Hidimba, then got married. They then had a son, Ghatotkacha, (who later proved to be a great warrior in the war against Kauravas).