Complex sentence: Locomotives of this series were built with two types of gearbox: first had one speed range (factory number: Ls150), and the other a quadruple gearbox with two speed ranges (factory number: 2Ls150).
Split into simpler sentences: Locomotives of this series were built with two types of gearbox. The first had one speed range (factory number: Ls150), and the second had a quadruple gearbox with two speed ranges (factory number: 2Ls150).