Niske Subtitle Edit, as mentioned, is super easy to use to offset subtitle sync (or apply a linear stretch if it's gradually going out of sync). Otherwise if it's just a one-off you can press G and H to adjust the timings by +/-50ms in VLC.

Faramir: "You wish now that our places had been exchanged. That I had died and Boromir had lived."

Denethor: "Yes. I wish that."

Pippin (sotto voce): fuck

Ruining the best toilets on earth must be a real "Alexander wept" moment for Demi