It's not length as such, but grammatical complexity. Compare these lists: Guests included students from Mexico, Venezuela and Brazil ; the teachers who had accompanied them and taught the morning classes ; the teachers from the United States and Canada who had taught the afternoon classes ; and representatives of the organisations hosting the event. Guests included students, teachers, university lecturers, parents, trade union officials, local employers and city councillors.
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fivejedjonand the teachers who had accompanied the students and taught morning classes.Even if there was a comma in that last item, like, say, "… and the teachers who had accompanied the students, whose schedules were very busy, and taught morning classes?"
MattBryantEven if there was a comma in that last item, like, say, "… and the teachers who had accompanied the students, whose schedules were very busy, and taught morning classes?"I just wouldn't do that. The sentence has become too unwieldy.