Complex sentence: Amygdalin (from Ancient Greek:' "almond") is a poisonous cyanogenic glycoside found in many plants, but most notably in the seeds (kernels) of apricot, bitter almonds, apple, peach, and plum.
Split into simpler sentences: Amygdalin (from Ancient Greek:' "almond") is a naturally occurring chemical compound and it is classified as a cyanogenic glycoside. Amygdalin is found in many plants, but most notably in the seeds (kernels) of apricot, bitter almonds, apple, peach, and plum.