Complex sentence: Ph.D. interupted his post doctoral research in Maryland, USA to become the second Principal of St Xavier's College, then functioning in Bastora, and just in the process of being established, following the end of Portuguese rule in Goa.
Split into simpler sentences: Ph.D. interupted his post doctoral research in Maryland, USA. He became the second Principal of St Xavier's College, then functioning in Bastora, and just in the process of being established, following the end of Portuguese rule in Goa.