Complex sentence: Maxwell (1864) describes an electromagnetic theory of light, based on Ampere and Faraday induction experiments (Maxwell, II & VI), since radio waves propagate in vacuum, at the velocity of light, but induction is not optical.
Split into simpler sentences: Maxwell (1864) describes an electromagnetic theory of light, based on Ampere and Faraday induction experiments (Maxwell, II & VI). Radio waves propagate in vacuum, at the velocity of light, which is used to justify Maxwell's theory but induction is not optical.