Complex sentence: Puppetmon has the mentality of a spoiled brat and a fiery temper: having fun and playing games is all he wants to do, but the kind of games he plays involve death and destruction, even his toys are capable of inflicting pain on people.
Split into simpler sentences: Puppetmon has the mentality of a spoiled brat and a fiery temper. But the kind of games he plays involve death and destruction, even his toys are capable of inflicting pain on people.