Complex sentence: The guideway is built to the "ALWEG" track standard; for the first seven years the line only ran as the MGM Shuttle between MGM and Bally's stations--during this time two ex-Walt Disney World Mark IV monorail trains were used.
Split into simpler sentences: The guideway is built to the "ALWEG" track standard; for the first seven years, the line only ran as the MGM Shuttle, between MGM and Bally's stations. During this time, two ex-Walt Disney World Mark IV monorail trains were used.