A mid sized mixed gender choir sings while the director motions to keep beat.
There is a mixed gender choir because two choir groups of opposite genders combined into one.
Sentence 1 does not state that the reason their is a mid sized mixed gender choir group because two singular sex choirs combined.
(-x)
exists p1 p2 x1.(exists e1 s2 s3 x4 x5 x6.(into(e1,x6) & n_thing(x6) & card_eq_1(x6) & Actor(e1,x4) & v_combine(e1) & of(x4,x5) & n_gender(x5) & a_opposite(s3) & Theme(s3,x5) & n_group(x4) & a_choir(s2) & Theme(s2,x4) & card_eq_2(x4)) & because(p1,p2) & exists s1 x2 x3.((x1 = x2) & n_choir(x2) & of(x2,x3) & n_gender(x3) & a_mixed(s1) & Theme(s1,x2)))