Complex sentence: Julian left Canada to join Olympique Marseille's youth academy and two years later, at the age of 12, Jonathan followed him to Europe, joining the Feyenoord youth academy in the Netherlands.
Split into simpler sentences: Julian left Canada to join Olympique Marseille's youth academy. Two years later, at the age of 12, Jonathan followed him to Europe, joining the Feyenoord youth academy in the Netherlands.