Complex sentence: After finding out Conan's plan, Vermouth was forced to see her boss, until she knocks out Conan with sleeping gas, and told him that if he wakes up first, he will have to call the police about the boss of the black organization.
Split into simpler sentences: After finding out Conan's plan, Vermouth was forced to see her boss, so she knocks out Conan with sleeping gas. She told him that if he wakes up first, he can call the police about the boss of the black organization.