A man in a white t-shirt with long hair playing a keyboard.
A long haired man wearing a white shirt is playing on the keyboard.
" wearing a white shirt " is a rephrasing of "  in a white t-shirt  ". Playing a keyboard implies playing on the keyboard.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & n_keyboard(x5) & (x1 = x4) & in(x1,x2) & with(x2,x3) & n_hair(x3) & a_long(s2) & Theme(s2,x3) & n_t-shirt(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))
exists e1 e2 s1 s2 s3 x1 x2 x3 x4.(n_keyboard(x4) & on(e2,x4) & Actor(e2,x1) & v_play(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_shirt(x3) & a_white(s3) & Theme(s3,x3) & (x1 = x2) & n_man(x1) & a_haired(s2) & Theme(s2,x1) & a_long(s1) & Theme(s1,x1))