Complex sentence: Rita Winslow (Kathryn Grayson), the hotel's owner and childhood sweetheart of Montera, hire Doc and Wishy as house detectives, who discover the Nazi codebook and give it to Montera.
Split into simpler sentences: Rita Winslow (Kathryn Grayson), the hotels owner and childhood sweethear of Montera, hire them as house detectives. The boys discover the Nazi codebook and give it to Montera.