Complex sentence: After his father's death in 1920, Aguirre moved with his family to Algorta, close to Bilbao where at the age of 16, he had to become a father figure to his 10 younger brothers and sisters.
Split into simpler sentences: After his father's death in 1920, Aguirre moved with his family to Algorta, close to Bilbao. At 16 years of age, he had to become a father figure to his 10 younger brothers and sisters.