Complex sentence: When he was younger, he befriended princess Flora, the ruler of the kingdom of Carl, and Loca, the general of Carl's army, usually goofing around behind his thick glasses to hide his true power from everyone.
Split into simpler sentences: When he was younger, he befriended princess Flora, the ruler of the kingdom of Carl, and Loca, the general of Carl's army. He usually spent time goofing around while wearing thick glasses to hide his true power from everyone.