Complex sentence: Aylesbury may also feature in the Croxley Rail Link project which envisages re-routing part of the London Underground Metropolitan line to Watford Junction; proposals also exist to start direct rail services between Watford Junction and Aylesbury via Rickmansworth and Amersham.
Split into simpler sentences: Aylesbury may also feature in the Croxley Rail Link project which envisages re-routing part of the London Underground Metropolitan line to. Proposals also exist to start direct rail services between Watford Junction and Aylesbury "via" Rickmansworth and Amersham.