Complex sentence: Local authorities resent an outsider, especially one with a reputation as tarnished as Fuhrman's, invading their turf and do everything they can to block his access to official reports.
Split into simpler sentences: Local authorities resent an outsider, especially one with a reputation as tarnished as Fuhrman's, invading their turf. They do everything they can to block Fuhrman's access to official reports.