Aeschylus designed costumes, trained his choruses, and probably acted in most of his own plays, (as was) the usual practice among ancient Greek dramatists.
why is as was is correct and (it was) isn’t? aren"t both of them nake this sentence a run on?
‘as’ initiates a dependent clause and serves as a conjunction connecting both parts, but ‘it’ is a pronoun which clearly cannot connect sentences. (run-on)
thx for all!