Complex sentence: The Athens Olympic Sports Complex, the largest sports complex in Greece, is also located here; its main street is Kifisias Avenue, and also contains four ISAP train stations and two of the Suburban Railway.
Split into simpler sentences: The Athens Olympic Sports Complex, the largest sports complex in Greece, is also there. Its main street is Kifisias Avenue, and also contains four of the ISAP train stations and two of the Suburban Railway.