Complex sentence: Book No.89, Hadith No.299 etc. but interest in the identity and history of the group increased over time, and discussions and investigations about the Sabians began to appear in later Islamic literature.
Split into simpler sentences: Book No.89, Hadith No.299 etc. but interest in the identity and history of the group increased over time. Discussions and investigations of the Sabians began to appear in later Islamic literature.