Complex sentence: Influenced by some of his secondary school teachers who were recognized leading intellectuals as well as some of his classmates and school mates who became leading intellectuals of the period between the two World Wars he went on to become a leading intellectual of that period.
Split into simpler sentences: Influenced by some of his secondary school teachers who were recognized leading intellectuals as well as some of his classmates and school mates who became leading intellectuals of the period between the two World Wars. He went on to become a leading intellectual of that period.