Complex sentence: José Ortega y Gasset (9 May 1883--18 October 1955) was a Spanish liberal philosopher and essayist working during the first half of the 20th century while Spain oscillated between monarchy, republicanism and dictatorship.
Split into simpler sentences: José Ortega y Gasset (9 May 1883--18 October 1955) was a Spanish liberal philosopher, and essayist. He worked during the first half of the 20th century, while Spain oscillated between monarchy, republicanism, and dictatorship.