Complex sentence: The first constitution of Honduras, dated 11 December 1825 established 4-year terms for the head of state, with Herrera's initial mandate concluding on 16 September 1827, but he was unable to conclude his mandate due to a coup d'état.
Split into simpler sentences: The first constitution of Honduras, dated 11 December 1825 established 4-year terms for the head of state, with Herrera's initial mandate concluding on 16 September 1827. He was however unable to conclude his mandate due to a coup d'état.