Complex sentence: The average rainfall throughout the year is 3,500-4,000 mm and the minimum temperature is 15-17 degree Celsius in December and highest temperature reaches 28-30 degree Celsius in April.
Split into simpler sentences: The average rainfall throughout the year is 3,500-4,000 millimeter. The minimum temperature is 15-17 degree Celsius in December, and highest temperature reaches 28-30 degree Celsius in April.