Complex sentence: Allegorically, the "Inferno" represents the Christian soul seeing sin for what it really is, and the three beasts represent three types of sin: the self-indulgent, the violent, and the malicious.
Split into simpler sentences: Allegorically, the "Inferno" represents the Christian soul seeing sin for what it really is. The three beasts represent three types of sin: the self-indulgent, the violent, and the malicious.