Complex sentence: Breeders are working to prevent losing heterozygosity and to maintain sufficient genetic variations, but high kinship value means the breed is not able to maintain a steady level of inbreeding in the long term.
Split into simpler sentences: Breeders are working to prevent losing heterozygosity and to maintain sufficient genetic variations. High kinship value means the breed is not able to maintain a steady level of inbreeding in the long term.