Complex sentence: Groves's fellow campaigners included Gassiot, Leonard Horner and Edward Sabine and their principal objectives were for the number of new Fellows to be subject to an annual limit and limitation of the power of nomination to the Council.
Split into simpler sentences: Groves's fellow campaigners included Gassiot, Leonard Horner and Edward Sabine. Their principal objectives were for the number of new Fellows to be subject to an annual limit, and limitation of the power of nomination to the Council.