Complex sentence: Hannelore Kohl had committed suicide after years of suffering from what she claimed was a very rare and painful photo allergy that was induced by an earlier penicillin treatment and had forced her to practically avoid all sunlight for years.
Split into simpler sentences: Hannelore Kohl had committed suicide after years of suffering from a very rare and painful photo allergy. Induced by an earlier penicillin treatment, the illness had forced her to practically avoid all sunlight for years.