Complex sentence: Desiree was shown to be the last to receive a rose, she is clearly holding one in the background while Selma and Sarah receive theirs during the rose ceremony so she must have been higher in the call-out order and was shown last through editing.
Split into simpler sentences: Desiree was shown to be the last to receive a rose, but she is clearly holding one in the background while Selma and Sarah receive theirs during the rose ceremony. Therefore she must have been higher in the call-out order and was shown last through editing.