Complex sentence: A high-speed rail between Buenos Aires, Rosario and Córdoba with speeds up to 320 km/h is in the design stages, construction was supposed to begin by early 2009 for the first segment to Rosario.
Split into simpler sentences: A high-speed rail between Buenos Aires, Rosario and Córdoba with speeds up to 320 km/h is in the design stages. Construction was supposed to begin by early 2009 for the first segment to Rosario.