Complex sentence: An active Nationalist, in 1881 he was arrested and confined in Kilmainham Jail, and then dismissed from his post as a medical officer to the North Dublin Union by Chief Secretary W. E. Forster.
Split into simpler sentences: An active Nationalist, in 1881 he was arrested and confined in Kilmainham Jail. As a result of this prison term he was dismissed from his post as a medical officer to the North Dublin Union by Chief Secretary W. E. Forster.