Complex sentence: Following a Coup d'Etat, in which the pro-Western king Narai was replaced by Petracha, Siamese troops besieged the French fortress in Bangkok for four months until a negotiated settlement was reached allowing the French to leave the country.
Split into simpler sentences: Following a Coup d'Etat, in which the pro-Western king Narai was replaced by Petracha, Siamese troops besieged the French fortress in Bangkok for four months. Finally, a negotiated settlement was reached allowing the French to leave the country.