Complex sentence: Following the evaluation of its population size, this was found to be incorrect, and it is consequently uplisted to Near Threatened status in 2008; though it is still a rather common bird, its numbers are noticeably declining.
Split into simpler sentences: Following the evaluation of its population size, this was found to be incorrect, and it was consequently promoted to Near Threatened status in 2008. Though it is a common bird, its numbers are noticeably declining.