Complex sentence: It disappeared from Europe over 300 years ago, and is now critically endangered: there are only around 500 wild birds in southern Morocco, and fewer than ten in Syria, where it was rediscovered in 2002.
Split into simpler sentences: It disappeared from Europe over 300 years ago, and is now considered critically endangered. There are believed to be about 500 wild birds remaining in southern Morocco, and fewer than 10 in Syria, where it was rediscovered in 2002.