How many pronouns are there in this sentence They stared in amazement at him as he admitted that he had forgotten it?

There are 6 pronouns in the sentence:

• they, personal pronoun, subject of the sentence;
• him, personal pronoun, object of the preposition 'at';
• he, personal pronoun, subject of the verb 'admitted';
• that, relative pronoun, introduces the relative clause;
• he, personal pronoun, subject of the relative clause;
• it, personal pronoun, direct object of the verb 'had forgotten'.