Complex sentence: Some animals seasonally go into long periods of inactivity, with reduced body temperature and metabolism, made up of multiple torpor bouts known as hibernation if it occurs during winter, or aestivation if it occurs during the summer.
Split into simpler sentences: Some animals seasonally go into long periods of inactivity, with reduced body temperature and metabolism, made up of multiple bouts of torpor. This is known as hibernation if it occurs during winter or aestivation if it occurs during the summer.