Complex sentence: Five-car train operations on the EPCOT Center beam was rare as the 5-car trains could easily exceed speed limits as they were some 22,500 pounds lighter than their 6-car sisters.
Split into simpler sentences: Five-car train operations on the EPCOT Center beam was rare. The 5-car trains could easily exceed speed limits as they were some 22,500 pounds lighter than their 6-car sisters.