Complex sentence: There are four legs in the system radiating directionally out into the suburbs from the downtown core that are connected by shared tracks along a downtown transit mall and organized into two CTrain lines (identified as the Red Line and the Blue Line on network maps).
Split into simpler sentences: There are four legs in the system radiating directionally out into the suburbs from the downtown core that are connected by shared tracks along a downtown transit mall. They have been organized into two CTrain lines (identified as the Red Line and the Blue Line on network maps).