Original sentence: Since then internal discussions have continued  and managers are now considering the possibility of the last planned Shuttle flight (STS-133) leaving its MPLM permanently attached.The United Launch Alliance has also published a proposal for a system that could allow additional ISS modules to be launched on an EELV even after the retirement of the Shuttle
Edited sentence: Internal discussions continued  and managers considered the possibility of the last planned Shuttle flight (STS-133) leaving its MPLM permanently attached.The United Launch Alliance has also published a proposal for a system that could allow additional ISS modules to be launched on an EELV even after the retirement of the Shuttle.. On August 5th 2009 it was announced that STS-133 would indeed leave its PLM permanently attached to the station