Complex sentence: At the age of 15 he began working at his family's restaurant in Palma de Mallorca, Spain--learning about the hospitality industry from food service to day-to-day operations, and spending his nights exploring the nightclub scene.
Split into simpler sentences: At the age of 15 he began working at his family's restaurant in Palma de Mallorca, Spain. He learned about the hospitality industry--from food service to day-to-day operations--and spent his nights exploring the nightclub scene.