Complex sentence: It was fitted with removable frets so it could be played as a viola da gamba or have a chin rest fitted and played as a viola da brascia or it would have pegs fitted and played as a table viola.
Split into simpler sentences: It was fitted with removable frets so it could be played as a viola da gamba. It could also have a chin rest fitted and be played as a viola da braccio or it could have pegs fitted and be played like a table viola.