Complex sentence: Later, Chandradathan took up the assignment of developing rocket nozzles, primarily for solid motors and became the head of the ablative nozzle production unit in 2000 where he remained till 2004.
Split into simpler sentences: Later, Chandradathan took up the assignment of developing rocket nozzles primarily for solid motors. He became the head of the ablative nozzle production unit in 2000, where he remained till 2004.