a person in pink pants playing a guitar
A person is wearing pink pants
The person is wearing pink pants in both sentences, so we can assume they are about the same person playing guitar.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_guitar(x4) & (x2 = x3) & n_pants(x2) & a_pink(s1) & Theme(s1,x2) & n_person(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_pants(x2) & a_pink(s1) & Theme(s1,x2) & n_person(x1))