Complex sentence: Park and his commandos steal several liters of CTX as it's being transported, and Park later calls Yu and issues an ultimatum: he has concealed several CTX bombs around Seoul, and will give him just enough time to find each one before setting them off.
Split into simpler sentences: Park and his commandos steal several liters of CTX as it's being transported. Later, Park calls Yu and issues an ultimatum: he has concealed several CTX bombs around Seoul, and will give him just enough time to find each one before setting them off.