Complex sentence: In 1932, of dacitic tephra erupted from Quizapu Crater on the northern flank of Cerro Azul in one of the largest explosive eruptions of the 20th century.
Split into simpler sentences: In 1932, of dacitic tephra was erupted from Quizapu Crater on the northern flank of Cerro Azul. This was one of the largest volcanic eruptions of the 20th century.