Complex sentence: Revox also produced well-regarded cassette tape recorders, notably the B710 and later the B215, which used the same transport and substantially the same electronics as the more expensive Studer A710 and Studer A721, respectively.
Split into simpler sentences: Revox also produced exceptional cassette tape recorders, notably the B710 and later the B215. Both used the same transport and substantially the same electronics as the more expensive Studer A710 and Studer A721, respectively.