Complex sentence: Brighton & Hove Buses also use the key on their buses however you are unable to use a B&H bus key on Southern and vice versa at the moment unless using Plusbus however southern is looking to change this by the end of 2013.
Split into simpler sentences: Brighton & Hove Buses also use The Key on their buses but it is not possible to use a B&H bus key on Southern and vice versa at the moment unless using Plusbus. Southern is looking to change this by the end of 2013.