Complex sentence: Eric Waterworth built three prototypes of his invention, one of which was sold to Home Recreations as a model for its proposed Salonola record player as cited above, which is now reportedly in the collection of the Powerhouse Museum in Sydney.
Split into simpler sentences: Eric Waterworth built three prototypes of his invention and one of these was sold to Home Recreations as a pattern for their proposed Salonola record player. This prototype is now reported to be in the collection of the Powerhouse Museum in Sydney.