Off Peak return is £54.70 and is valid on any train.
There are barriers at Leeds, and they should accept the ticket, but if they don't show it at the gateline, you are allowed to break your journey always on the return portion of any ticket (and even if you weren't, you are allowed through barriers to access station facilities!)
Without checking the RG, I know that Leeds and Sheffield are equally valid routes. In both cases you will pass through Manchester so you could split there.
LIV-MAN SVR (valid for arrivals into MAN from 0930) £12.10 or
LIV-MAN SOR (Valid any train) £15.80
MAN-HUL SVR (Valid any train) £38.30
Total = £50.40 (Save £3.30) or £54.10 (Save 60p)
Absolute cheapest I can think of, If you don't mind a slow journey via Donny both ways...
Liverpool-Manc SVR £12.10
Ashton U Lyne-Thorne Stns SVR £16.90
Thorne Stns-Hull SOR £17.80
Total = £46.80 (Not worth it having to get stopping trains, and Hull-Leeds via Thorne and Adwick versus via Selby is a long way round)
Fares into Hull are scandalously high priced. And TPE charge quite a premium for going to Liverpool rather than Manchester. So, when combined, the price is rather poor value.
With the railways, you don't get a bulk discount for getting a longer distance ticket. Indeed, you get penalised. If the railways sold multipacks, they'd cost more than the individual products. And if they ran restaurants, a 3 course meal would cost more than the individual cost of each course.
