Complex sentence: Braid maintained an active interest in hypnotism until his death; and just three days before his death he sent a (now lost) manuscript, written in English, "On hypnotism", to the French surgeon Étienne Eugène Azam.
Split into simpler sentences: Braid maintained an active interest in hypnotism until his death. Just three days before his death he sent a (now lost) manuscript, written in English, "On hypnotism", to the French surgeon Étienne Eugène Azam.