Complex sentence: Under his direction, four former Canadian National locomotives, three EMD FP9As and an F9B units were purchased and painted a very dark green, similar to the paint scheme of the business fleet.
Split into simpler sentences: Under his direction, four former Canadian National locomotives, three EMD FP9A and a F9B (three A, and one B) units were purchased. Painted a dark green, they were similar to the paint scheme of the business fleet.