Complex sentence: FBI management was very upset about several gifts to the Black Panther Party, totalling $10,500 (estimated) in contributions; these were noted among a list of other celebrities in FBI internal documents later released under FOIA.
Split into simpler sentences: FBI management was very upset about several gifts to the Black Panther Party, totalling $10,500 (estimated) in contributions. Her contributions to Black Panther Party were noted among a list of other celebrities in FBI internal documents later released under FOIA.