Complex sentence: The entrance and surrounding areas of their nest are coated with a smooth, thick layer of black, red, or yellow cerumen, a material formed by mixing beeswax (a glandular secretion of worker bees) with propolis.
Split into simpler sentences: The entrance and surrounding areas of their nest are coated with a smooth, thick layer of black, red, or yellow cerumen. Cerumen is a material formed by mixing beeswax (a glandular secretion of worker bees) with propolis.