Complex sentence: His son Baldomero Lamela (1838-1901) was Intendant of Areco and was also a soldier, participating in the Paraguayan War and the Conquest of the Desert.
Split into simpler sentences: His son Baldomero Lamela (1838-1901), was Intendant of Areco. And had also been military, participated in the Paraguayan War and the Conquest of the Desert.