Complex sentence: Sadly since 2006, Bees have been disappearing due to CCD (Colony Collapse Disorder) caused by Neonicotinoids which are a type of pesticide that harms honeybees and their colonies.
Split into simpler sentences: Sadly since 2006, Bees have been disappearing due to CCD (Colony Collapse Disorder). Neonicotinoids are a type of pesticide that harms honeybees and their colonies.