Complex sentence: However, its numbers have been sharply reduced by overfishing in recent years, and as it is a slow breeder, it is vulnerable to overexploitation, and is recognised as endangered on the IUCN Red List.
Split into simpler sentences: However, its numbers have been sharply reduced by overfishing in recent years, and it is a slow breeder. The species is therefore highly vulnerable to overexploitation, and is recognised as endangered on the IUCN Red List.