Complex sentence: Franklin's machine was unique in that he used a scientific glass with specific materials to be used by the glass maker Caspar Wistar for the making of the globe, so as to produce static electricity effectively.
Split into simpler sentences: Franklin's machine was unique in that he specified certain materials to be used in the construction of the glass globe made by the maker Caspar Wistar. This was then a scientific glass designed so as to produce static electricity effectively.