Complex sentence: The two indoor rinks within the T.G. Smith Centre are designated as the Centennial Arena, the older rink which has a capacity of 1,450, and the T.G. Smith Arena, the newer rink with a capacity of approximately 300.
Split into simpler sentences: The two indoor rinks within the T.G. Smith Centre are designated as the Centennial and T.G. Smith Arenas. The older Centennial Arena has a maxmimum capacity of 1,450, while the newer T.G. Smith Arena has a capacity of approximately 300.