A gentleman with a long beard is at a concert playing a fur lined base guitar.
The man with the short beard plays the violin at the concert.
MAN WITH BEARD EITHER BE PLAYING fur lined base guitar OR  violin
exists p1 s1 x1 x2.(exists e2 e1 x3 x4 x5 x6 x7.(at(x1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_guitar(x5) & of(x5,x7) & n_base(x7) & Theme(e1,x5) & v_line(e1) & of(x5,x6) & n_fur(x6) & (x3 = x4) & n_concert(x3)) & with(x1,x2) & n_beard(x2) & a_long(s1) & Theme(s1,x2) & n_gentleman(x1))
exists e1 s1 x1 x2 x3 x4.(n_concert(x4) & n_violin(x3) & n_beard(x2) & a_short(s1) & Theme(s1,x2) & n_man(x1) & at(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & with(x1,x2))