Complex sentence: In 2000, he obtained a classical diploma in Rome, after he enrolled in communication sciences but decided to move to London, where he remained more than a year, working as a waiter, and following English courses.
Split into simpler sentences: In 2000, he obtained a classical diploma in Rome, after he enrolled in communication sciences. He decided to move to London, where he remained more than a year working as a waiter, and following English courses.