Complex sentence: Outside of London this was a corporate livery of Aquamarine with a Cotswold stone (cream) swoop, "Arriva" branding and a strapline of the region the bus was operating in which for the former North Western operation was "serving the North West".
Split into simpler sentences: Outside of London this was a corporate livery of aquamarine with a Cotswold stone (cream) swoop, "Arriva" branding and a strap-line of the region the bus was operating in. For the former North Western operation this strap-line was "serving the North West".