Complex sentence: Peri locates the TARDIS manual and presents it to the Doctor who quickly dismisses it, as he knows perfectly well that transitional elements within the TARDIS have stopped producing orbital energy only Zeiton-7 ore can realign the power systems.
Split into simpler sentences: Peri locates the TARDIS manual and presents it to the Doctor who quickly dismisses it. He knows perfectly well that transitional elements within the TARDIS have stopped producing orbital energy only Zeiton-7 ore can realign the power systems.