Complex sentence: In June 1902 a passenger service commenced between East Greta Junction and Stanford Merthyr, intermediate stations were at East Greta and Heddon Greta, with the opening of the Aberdare Railway a station was opened at Aberdare Junction.
Split into simpler sentences: In June 1902 a passenger service commenced between East Greta Junction and Stanford Merthyr. Intermediate stations were at East Greta and Heddon Greta, and, with the opening of the Aberdare Railway, a station was opened at Aberdare Junction.