Complex sentence: He completed his undergraduate studies at Bilaspur and graduated from IIT Kanpur in Physics, then joined the Physical Research Laboratory (PRL) in Ahmedabad in 1973 for doctoral research.
Split into simpler sentences: He completed his undergraduate studies at Bilaspur and graduated from IIT Kanpur in Physics. He joined Physical Research Laboratory (PRL) in Ahmedabad in 1973 for the doctoral research.