Complex sentence: WHEN ADDING A NEW ROUTE, OR ADDING AN END DATE FOR A ROUTE PLEASE ADD A REFERENCE, ALSO ADD THE ROUTE AND LINK ON THE CORRESPONDING AIRPORTS ARTICLE AND THE AIRLINES ARTICLE IF IT IS A NEW DESTINATION, ANYTHING WHICH IS NOT REFERENCED WILL BE REMOVED.
Split into simpler sentences: WHEN ADDING A NEW ROUTE OR AN END DATE FOR A ROUTE PLEASE ADD A REFERENCE. ALSO, ADD THE ROUTE AND LINK ON THE CORRESPONDING AIRPORT'S ARTICLE AND THE AIRLINE'S ARTICLE IF IT IS A NEW DESTINATION, ANYTHING WHICH IS NOT REFERENCED WILL BE REMOVED.