Complex sentence: First elected onto the IRA Executive at the November 1925 IRA General Army Convention, he became a full-time IRA activist although described his profession as "journalist", justified somewhat by his regular contributions to the IRA weekly newspaper, "An Phoblacht".
Split into simpler sentences: First elected onto the IRA Executive at the November 1925 IRA General Army Convention, he became a full-time IRA activist. He disguised this by describing his profession as "journalist", justified somewhat by his regular contributions to the IRA weekly newspaper, "An Phoblacht".