Complex sentence: It was founded in England in 1864 by Frederick James Furnivall; its stated goal in a report of the first year of their existence was on the one hand, to print all that is most valuable of the yet unprinted MSS.
Split into simpler sentences: It was founded in England in 1864 by Frederick James Furnivall. Its stated goal in a report of the first year of their existence was on the one hand, to print all that is most valuable of the yet unprinted MSS.