Complex sentence: Following his interest in hypnotism, especially in its "introspective" variant, Bleuler became interested in Sigmund Freud's work, favorably reviewing Josef Breuer and Sigmund Freud's "Studies on Hysteria".
Split into simpler sentences: Following his interest in hypnotism, especially in its "introspective" variant, Bleuler became interested in Sigmund Freud's work. He favorably reviewed Josef Breuer and Sigmund Freud's "Studies on Hysteria".