Complex sentence: Even prior to Rizal's banishment to Dapitan, Rizal was already regarded by the Filipino people as a national hero, having been elected as honorary president by the "Katipunan".
Split into simpler sentences: Even prior to Rizal's banishment to Dapitan, Rizal was already regarded by the Filipino people as a national hero. He was elected as honorary president by the "Katipunan".