Complex sentence: Wizards can act the part of the absent-minded professor, being foolish, prone to misconjuring, and generally less than dangerous; they can also be terrible forces, capable of great magic, both good or evil.
Split into simpler sentences: Wizards can act the part of the absent-minded professor, being foolish, prone to misconjuring, and generally less than dangerous. They can also be terrible forces, capable of great magic, both good or evil.