Complex sentence: Apitoxin, or honey bee venom, is a bitter colourless liquid; its active portion a mixture of proteins, which causes local inflammation and acts as an anticoagulant.
Split into simpler sentences: Apitoxin, or honey bee venom, is a bitter colourless liquid. The active portion of the venom is a complex mixture of proteins, which causes local inflammation and acts as an anticoagulant.