Complex sentence: In July 2015, the MTA confirmed that it was considering restoring the W train in order to maintain service levels on the BMT Astoria Line in Queens once the Q train is rerouted from the Astoria Line to the Second Avenue Line in Manhattan's Upper East Side.
Split into simpler sentences: In July 2015, the MTA confirmed that it was considering restoring the W designation in order to maintain service levels on the Astoria Line in Queens. The W service would be restored after the Q service is rerouted from the Astoria Line to the Second Avenue Line in Manhattan's Upper East Side.