Complex sentence: This patch also lowered the speed at which wheeled mechs operated, curbed the effectiveness of shotguns at destroying bases and lowered their overall effectiveness by adding recoil which stops wheeled mechs in their tracks.
Split into simpler sentences: This patch also lowered the speed at which wheeled mechs operated. Curbed the ability of shot guns to be effective against destroying bases as well as lowered their overall effectiveness by adding recoil that stops wheeled mechs in their tracks.