Complex sentence: At the age of 17 he went to Maynooth and was ordained on the 21 June 1931 and spent most of his ministry as a Professor of Dogmatic Theology at St Patrick's College, Maynooth.
Split into simpler sentences: At the age of 17 he went to Maynooth, and was ordained on the 21 June 1931. He spent most of his ministry as a professor of dogmatic theology at St Patrick's College, Maynooth.