Complex sentence: Although Maui's daytime temperatures average between 75 and 90 degrees year round, evening temperatures are about 15 degrees cooler in the more humid windward areas, about 18 degrees cooler in the dryer leeward areas, and cooler yet in higher elevations.
Split into simpler sentences: Although Maui's daytime temperatures average between 75 and 90 degrees year round. Evening temperatures are about 15 degrees cooler in the more humid windward areas, about 18 degrees cooler in the dryer leeward areas, and cooler yet in higher elevations.