Complex sentence: He fought alongside English poet, Lord George Byron, during the Greek war of independence and established a Society of Friends, a secret organisation aimed at overthrowing Ottoman rule, in both Corfu and his home town, Argostoli.
Split into simpler sentences: He fought alongside the poet, Lord George Byron, during the Greek war of independence. He established a secret organisation aimed at overthrowing Ottoman rule based in both Corfu and his home town, Argostoli.