Conversation so far:
When was Fethullah Gulen's split with President erdogan?
Analysts believed that a number of arrests made against allies of Recep Tayyip Erdoğan reflect a power struggle between him and Fethullah Gülen. These arrests led to a corruption scandal.
Who was Recep Tayyip Erdogan?
Recep Tayyip Erdoğan is a Turkish politician serving as President of Turkey since 2014.
Are there any other interesting aspects about the Fethullah Gulen article?
Recep Tayyip Erdoğan's government came to the decision early in December 2013 to shut down many of his movement's private pre-university schools.

Question: Was he ever arrested?
Self-contained rewrite: Was Fethullah Gulen ever arrested?