Complex sentence: The first manager of Mitchelstown Co-operative Creameries, was Eamon Roche; a Dairy Science Diploma graduate of the Albert College in Dublin (now called Dublin City University-DCU) who had been active in the Irish War of Independence from Britain between 1916--1921.
Split into simpler sentences: The first manager of Mitchelstown Co-operative Creameries, was Eamon Roche. Roche was a Dairy Science Diploma graduate of the Albert College in Dublin (now called Dublin City University-DCU) who had been active in the Irish War of Independence from Britain between 1916--1921.