Complex sentence: Imprisoned on numerous occasions, North and South, he embarked on a number of hunger strikes and also stood as a candidate for Clann na Poblachta before leaving that party because of their decision to go into government with Fine Gael.
Split into simpler sentences: Imprisoned on numerous occasions, both North and South of the border, he embarked on a number of hunger strikes. He stood as a candidate for Clann na Poblachta before leaving the party as a result of their decision to go into government with Fine Gael.