Complex sentence: In 1991 while Xavier Lopez Ancona was studying his master's degree in business administration, he was a student for marketing Professor Philip Kotler, and his classes, guide and knowledge were key factors when he decided to start and launch the concept of KidZania.
Split into simpler sentences: In 1991 while Xavier Lopez Ancona was studying his master's degree in business administration, he was a student of marketing with Professor Philip Kotler. His classes, guide and knowledge were key factors when he decided to start and launch the concept of KidZania.