Complex sentence: On December 26,1874, the recently built ironclad "Cochrane" arrived in Valparaíso; it remained in Chile until the completion of the "Blanco Encalada" threw the balance of south Pacific power towards Chile.
Split into simpler sentences: On December 26,1874, the recently built ironclad "Cochrane" arrived in Valparaíso; it remained in Chile until the completion of the "Blanco Encalada". It threw the balance of south Pacific power towards Chile.