Complex sentence: This gives two advantages: ground clearance is increased, particularly beneath the low-slung differential housing of the main axles; and secondly the hub gearing allows the axle halfshafts to drive the same power but at reduced torque (by using higher shaft speed).
Split into simpler sentences: This gives two advantages: ground clearance is increased, particularly beneath the low-slung differential housing of the main axles. Secondly the hub gearing allows the axle halfshafts to drive the same power but at reduced torque (by using higher shaft speed).