    Sentence 1: What-did the second stage in: the Saturn V.  end. up doing?    Sentence. 2: The’ second ‘and’ third -stages buirned liquid  hijdrogen, “and thé third’ stage was”e-modified version of  the:S-IVB. with thrust ineeased to 230,000 :lbf. (1,020 kN)  and’ capability to -festart,. the engine’ for. translunar  injection after reaching «- parking orbit    