Complex sentence: The Board of Trade refused to allow trains with an electric locomotive at the head and tail as this would require power lines the length of the train so thirty-two larger locomotives were ordered, although the CLR only received 28.
Split into simpler sentences: The Board of Trade refused to allow trains with an electric locomotive at the head and tail as this would require power lines the length of the train. Therefore thirty-two larger locomotives were ordered, but the CLR only received 28.