Complex sentence: He anchored first at the island of Santa Magdalena near present day Punta Arenas Chile, where in two hours they killed and salted two barrels full of penguins for food.
Split into simpler sentences: He anchored first at the island of Santa Magdalena near present day Punta Arenas, Chile. There, in two hours, they killed and salted two barrels-full of penguins for food.