Complex sentence: The first agriculture display in Snohomish County was held in 1874 when Monroe pioneer Salem Woods was vice-president of the Snohomish Agricultural Society, which makes the Fair one of the oldest in the State.
Split into simpler sentences: The first agriculture display in Snohomish County was held in 1874 when Monroe pioneer Salem Woods was vice-president of the Snohomish Agricultural Society. This would make the Fair one of the oldest in the State.