Complex sentence: In 1892 he became resident minister in Bangkok, Siam, and played an important role in the gunboat diplomacy of the Franco-Siamese War in 1893, which resulted in the establishment of the French protectorate over Laos.
Split into simpler sentences: In 1892 he became resident minister in Bangkok, Siam. He had an important role in the outbreak of the Franco-Siamese War in 1893, which led to the establishment of the French protectorate over Laos.