Complex sentence: The M25 London Orbital Motorway's junction 8 is at at the south of the ward, accessed by the former straight road, as mentioned the ward is less than in length, which is its maximum distance away from any given point.
Split into simpler sentences: The M25 London Orbital Motorway's junction 8 is at at the south of the ward, accessed by the former straight road. As mentioned the ward is less than in length so is the maximum distance away from this route from any given point.