Complex sentence: With the help of Lujei and Gammel Dore, he created the Philosopher's Stone at the request of the kingdom, but later made a contract with an ancient devil in order to use the Stone's power for himself.
Split into simpler sentences: With the help of Lujei and Gammel Dore, he created the Philosopher's Stone at the request of the kingdom. He later made a contract with an ancient devil in order to use the Stone's power for himself.