People watch a musician play the guitar.
A musician playing the guitar while scuba diving.
One cannot be scuba diving and play the guitar at the same time.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_guitar(x3) & (x2 = x3) & n_play(x2) & a_musician(s1) & Theme(s1,x2) & n_people(x1))
exists e1 x1 x2 x3 x4 x5.(n_guitar(x3) & a_topic(x1) & while(e1,x4) & n_diving(x4) & of(x4,x5) & n_scuba(x5) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_musician(x1))