Complex sentence: In 1777 and 1778, the post was partially inundated by flood waters, leading the captain, Balthazar de Villiers, to write the Spanish governor of Louisiana, Bernardo de Gálvez, requesting the post be moved upriver.
Split into simpler sentences: In 1777 and 1778, the post was partially inundated by flood waters. The garrison captain, Balthazar de Villiers, wrote to the Spanish governor of Louisiana, Bernardo de Gálvez, requesting the post be moved upriver.