A person in a red t-shirt with a white shirt over it, jumps off the top of a sand dune, while several other people sit and watch.
Several people watch a person wearing two shirts jump off the top of a sand dune.
Several people may be watching the man in the red t-shirt jumping off of the sand dune.  The second sentence states that the person is wearing two shirts.
exists e1 p1 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7 x8 x10.(n_people(x10) & n_top(x5) & a_topic(s1) & subset_of(x8,s1) & n_watch(x8) & subset_of(x1,s1) & exists e2 s5 x9.(Actor(e2,x9) & v_sit(e2) & -(x9 = x10) & n_people(x9) & a_several(s5) & Theme(s5,x9)) & while(e1,p1) & a_off(s4) & Manner(e1,s4) & Theme(e1,x5) & Actor(e1,x4) & v_jump(e1) & of(x5,x6) & n_dune(x6) & of(x6,x7) & n_sand(x7) & (x1 = x4) & in(x1,x2) & with(x2,x3) & over(x3,x1) & n_thing(x1) & n_shirt(x3) & a_white(s3) & Theme(s3,x3) & n_t-shirt(x2) & a_red(s2) & Theme(s2,x2) & n_person(x1))
exists e2 e3 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_top(x2) & a_off(s2) & Manner(e3,s2) & Actor(e3,x5) & v_jump(e3) & Theme(e2,x7) & Actor(e2,x6) & v_wear(e2) & n_shirt(x7) & card_eq_2(x7) & (x5 = x6) & n_person(x5) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & of(x2,x3) & n_dune(x3) & of(x3,x4) & n_sand(x4) & n_people(x1) & a_several(s1) & Theme(s1,x1))