In addition to being an accomplished playwright, Sophocles was also a priest and a military general. Priest because at the time, his house was used as a venue for religious ceremonies; he waited for a proper temple to be built, until then he didn't hesitate to take up for that position.
If only half arrives then the orchestra wouldnt be correct. For a sentence fragment, if you have half of a correct sentence and the other is incorrect... it doesnt work.
