Complex sentence: This stage began at the end of 1993 with the studies for and in October 1994 began the construction of the subterranean track between Buenavista Station (named after the Buenavista train station) and Garibaldi Station.
Split into simpler sentences: This stage began at the end of 1993 with the studies for. Construction began in October 1994 of the subterranean track between Buenavista Station (named after the Buenavista train station) and Garibaldi Station.