Complex sentence: The first Miss Congeniality award specific to the Miss USA pageant was given out in 1965, as prior to this the award could be won by either Miss USA or Miss Universe contestants, due to both pageants being held simultaneously.
Split into simpler sentences: The first Miss Congeniality award specific to the Miss USA pageant was given out in 1965. Prior to 1965, the award could be won by either Miss USA or Miss Universe contestants because both pageants were being held simultaneously.