Complex sentence: At standard temperature and pressure, two chlorine atoms form the diatomic molecule Cl 2, a yellow-green gas with a strong, distinctive odor, familiar to most people from common household bleach.
Split into simpler sentences: At standard temperature and pressure, two chlorine atoms form the diatomic molecule Cl 2. This is a yellow-green gas that has a distinctive strong odor, familiar to most people from common household bleach.