Complex sentence: Enraged at this, Harry reviels himself from his invisability cloak and casts the Cruciatus Curse, with such power that Amycus passes out.McGonagall then places the Imperius Curse on him, then binds him with his sister and places him inside a net.
Split into simpler sentences: Enraged at this, Harry casts the Cruciatus Curse, with such power that Amycus passes out. Later, McGonagall places the Imperius Curse on him, then binds him with his sister and places him inside a net.