Original sentence: Although it would be primarily used for Ares V flights, LC-39A can also support launches of the Ares I in the event LC-39B is damaged or destroyed in a launch pad accident.Because of the in-line design of the Ares V, the three existing MLPs, which dates back to Apollo and modified to accommodate the Shuttle, will undergo a major overhaul in order to accommodate the Ares V and its launch umbilical tower, which will have Apollo-like swing arms for the Earth Departure Stage and the Lunar Surface Access Module (LSAM)
Edited sentence: Although it would be primarily used for Ares V flights, LC-39A can also support launches of the Ares I in the remote chance LC-39B is damaged or destroyed in a launch pad accident.Because of the in-line design of the Ares V, the three existing MLPs, which dates back to Apollo and modified to accommodate the Shuttle, will undergoe a major overhaul in order to accommodate the Ares V and its launch umbilical tower, which will have Apollo-like swing arms for the Earth Departure Stage and the Lunar Surface Access Module (LSAM)