Complex sentence: Knorr-Bremse has been developing and manufacturing braking systems for commercial vehicles since 1920, for trucks and semi-trailer tractor units over 6 tonnes, buses, trailers or special vehicles.
Split into simpler sentences: Knorr-Bremse has been developing and manufacturing braking systems for commercial vehicles since 1920. For trucks and semi-trailer tractor units over 6 tonnes, buses, trailers or special vehicles.