After a sandstorm, a maintenance worker cleaned debris from the historic ruins.
there was a sandstorm
To clean debris there must be a disaster like a sandstorm.
exists e1 s1 x1 x2 x3 x4 x5.(n_ruin(x4) & a_historic(s1) & Theme(s1,x4) & after(e1,x5) & n_sandstorm(x5) & from(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & n_debris(x3) & n_worker(x1) & of(x1,x2) & n_maintenance(x2))
exists p1 x1 x2.((x1 = x2) & n_sandstorm(x2))