Complex sentence: Boyle's mention of the theory preceded the publication of "Experimental Philosophy" by one year, which, combined with Boyle's promotion of the idea and his significant status as an aristocratic scientist, ensured the theory's moniker of "Boyle's Law".
Split into simpler sentences: Boyle's mention of the theory preceded the publication of "Experimental Philosophy" by one year. That, combined with Boyle's promotion of the idea and his significant status as a nobleman scientist, ensured the theory's moniker of "Boyle's Law".