Complex sentence: The Perkins Brailler is a "braille typewriter" with a key corresponding to each of the six dots of the braille code, a space key, a backspace key, and a line space key.
Split into simpler sentences: The Perkins Brailler is a "braille typewriter" with a key corresponding to each of the six dots of the braille code. In addition to these six keys, the Perkins Brailler has a space key, a backspace key, and a line space key.