Complex sentence: Ugarte was head of the Eighth Division in the defense of the city of Arica, where he participated in the two military councils held by Colonel Francisco Bolognesi, where the agreement was made to defend the bastion "until burning the last round".
Split into simpler sentences: Ugarte was head of the Eighth Division in the defense of the city of Arica. In Arica, he participated in the two military councils held by Colonel Francisco Bolognesi, where the agreement was made to defend the bastion "until burning the last round".