Complex sentence: As of 2013, no Proton-M launches have been made without an upper stage, however this configuration is manifested to launch the Multipurpose Laboratory Module and European Robotic Arm of the International Space Station, currently scheduled to be launched together in 2016.
Split into simpler sentences: As of 2013, no Proton-M launches have been made without an upper stage. However, this configuration is manifested to launch the Multipurpose Laboratory Module and European Robotic Arm of the International Space Station, currently scheduled to be launched together in 2016.