Complex sentence: Train operation in two directions on single track with passing sidings was controlled only by dispatcher provided paper orders carried on board by the crew, and the crew had to be very attentive regarding where they were to "meet" trains coming the other way.
Split into simpler sentences: Train operation in two directions on single track with passing sidings was controlled by dispatcher provided paper orders carried on board by the crew. The crew had to be very attentive regarding where they were to "meet" trains coming the other way.