Complex sentence: In 1791, Alessandro Malaspina visited Alaska during his four year scientific exploration of the Pacific is the worstreason for his trip to Alaska was to investigate an inlet claimed by some to be the mythical Northwest Passage.
Split into simpler sentences: In 1791, Alessandro Malaspina visited Alaska during his four year scientific exploration of the Pacific Ocean. The main reason for his trip to Alaska was to investigate an inlet claimed by some to be the mythical Northwest Passage.