original: by the age of 21 , he was already recognized for composing more than 200 songs .
simplifications: by the age of 21 , he was already well-known for creating more than 200 songs . by the age of 21 , he was already recognized for composing more than 200 songs . by age 21 , he was already recognized for creating more than 200 songs . by the age og 21 , he was already known for writing more than 200 songs . by the age of 21 , he had already composed more than 200 songs . by the age of 21 , he was already known for writing more than 200 songs . by the age of 21 , he was already recognized for composing more than 200 songs . by the age of 21 , he was already recognized for composing more than 200 songs .