A group of men are doing a synchronized dance.
Guys are performing a dance.
'Guys' is a casual rephrasing of 'group of men'.  Doing and dance and performing a dance mean the same thing.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_dance(x3) & a_synchronized(s1) & Theme(s1,x3) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_dance(x2) & n_guy(x1))