Complex sentence: DCs 4133 and 4784 were withdrawn in February 2014 and October 2013 respectively, and were returned to service after the DL class was sidelined in March 2014.
Split into simpler sentences: DCs 4133 and 4784 were withdrawn in October 2013 (4784) and February 2014 (4133). They were returned to service after the DL class was sidelined in March 2014.