Complex sentence: In keeping with the show's history of ambiguity, Fowley's motivations were never explained, although many viewers assumed her to be deeply associated with the Syndicate conspirators and working against Mulder in his pursuit of the truth within the X-Files.
Split into simpler sentences: In keeping with the show's history of ambiguity, Fowley's motivations were never explained. Most viewers assumed her to be deeply associated with the Syndicate conspirators and working against Mulder in his pursuit of the truth within the X-Files.