What is Jeannot Szwarc's most popular movie and what is its average rating score?
Jeannot Szwarc's refers to director_name = 'Jeannot Szwarc'; most popular movie refers to MAX(movie_popularity); average rating score refers to avg(rating_score)
SELECT T2.movie_title, AVG(T1.rating_score) FROM ratings AS T1 INNER JOIN movies AS T2 ON T1.movie_id = T2.movie_id WHERE T2.director_name = 'Jeannot Szwarc' ORDER BY T2.movie_popularity DESC LIMIT 1