To produce a writer, you may require him to have something more than...
Producing a writer may require him/one to have something more than...
To produce a writer may require something more than...
2. A full-stop is more appropriate instead of a semi-colon between the two sentences.
3. 'yet it is argument enough in favour of those rules' - It is arguable/debatable whether the knowledge (of grammar rules) is required to be a competent and elegant writer. I wouldn' t use 'able' as an adjective for a writer.
4. a knowledge of grammar rules/knowledge of grammar rules - both are acceptable.
5. 'Knowing grammar rules' (gerund) is also acceptable but 'knowledge of grammar rules' is preferred.
not a teacher
Student or Learner