Complex sentence: In 1846, to raise funds for the Mexican-American War, the Pío Pico government sold the secularized lands from the Mission San Fernando to Eulogio de Celis, who established Rancho Ex-Mission San Fernando.
Split into simpler sentences: In 1846, to raise funds for the Mexican-American War, the Pío Pico government sold secularized Mission lands. The Mission San Fernando was sold to Eulogio de Celis, who established Rancho Ex-Mission San Fernando.