Complex sentence: In 1817 after many attempts and battles, troops under the command of Simón Bolivar and Manuel Piar, managed to overcome the Spanish troops, installing the Supreme Headquarters of the Republic, on October 15,1817, and incorporating the province of Guayana into Venezuela.
Split into simpler sentences: In 1817 after many attempts and battles, troops under the command of Simón Bolívar and Manuel Piar, managed to overcome the Spanish troops. They established the Supreme Headquarters of the Republic there, on October 15,1817, and incorporated the province of Guayana into Venezuela.