Complex sentence: He moved to Metropolitan Police but at the end of the 2006--07 season he decided to temporarily retire from football in order to dedicate his time for studying the knowledge in preparation for becoming a taxi-driver.
Split into simpler sentences: He moved to Metropolitan Police but at the end of the 2006--07 season he decided to retire. Luke retired from football in order to dedicate his time for studying the knowledge in preparation for becoming a taxi-driver.