Complex sentence: Once again, he advocated a tub-boat canal, this time with three inclined planes: two twin-track inclines, which were counter-balanced, and a third, single-track incline, which required power.
Split into simpler sentences: Once again, he advocated a tub boat canal, this time with three inclined planes. Two were twin track inclines, which were counter-balanced, and the third was a single-track incline, which required power.