Complex sentence: The trunks of this room were property of Simón Bolívar, there he used to carry the most important documents of war, and there is also a big picture of Jesus painted by Gregorio Vasquez de Arce y Ceballos.
Split into simpler sentences: The trunks of this room were the property of Simón Bolívar, and in which he used to carry the most important documents of war. There is also a large painting of Jesus by Gregorio Vasquez de Arce y Ceballos.