Complex sentence: Wallace believes that the committee has a blacklist of observers, from whom it will automatically reject records, unless there are other observers able to corroborate the sighting; he mentions two specific observers, both of whom live in remote parts of northern Scotland.
Split into simpler sentences: Wallace believes that the committee has a blacklist of observers, from whom it automatically rejects records unless there are other observers able to corroborate the sighting. He mentions two specific observers, both of whom live in remote parts of northern Scotland.