Complex sentence: Another major advantage of the M102 was that it could be traversed a full 6,400 mils; the M101A1 had a limited on-carriage traverse, which required its trails (stabilizing legs) to be shifted if further traverse was necessary.
Split into simpler sentences: Another major advantage of the M102 was that it could be traversed a full 6,400 mils. The M101A1 had a limited on-carriage traverse, which required its trails (stabilizing legs) to be shifted if further traverse was necessary.