Among the books published by publisher "Thomas Nelson", how many of them have over 300 pages?
"Thomas Nelson" is the publisher_name; books with over 300 pages refers to num_pages > 300
SELECT COUNT(*) FROM book AS T1 INNER JOIN publisher AS T2 ON T1.publisher_id = T2.publisher_id WHERE T2.publisher_name = 'Thomas Nelson' AND T1.num_pages > 300