Complex sentence: Two sets can be coupled together with Scharfenberg type automatic couplers, supplied as part of the so-called front ends, which also include the surrounding structure, by German industrial company Voith.
Split into simpler sentences: Two sets can be coupled together with automatic couplers of the Scharfenberg type. The couplers and the surrounding structure form an integral unit, the so-called front ends, which were supplied by German industrial company Voith.