Complex sentence: The keyboard is an orthographic chordkeyboard, very different from chordphonetic keyboards used for verbatim transcription, such as Stenotype, as these are mainly for stenography, which depend on phonetic codes representing speech.
Split into simpler sentences: The keyboard is an orthographic chord keyboard, very different from chorded phonetic keyboards used for verbatim transcription, such as Stenotype. Stenography keyboards are mainly for stenography, which depend on phonetic codes representing speech.