Complex sentence: Owners of Bernese Mountain Dogs are nearly three times as likely as owners of other breeds to report musculoskeletal problems in their dogs; the most commonly reported being cruciate ligament rupture, arthritis (especially in shoulders and elbows), hip dysplasia, and osteochondritis.
Split into simpler sentences: Owners of Bernese Mountain Dogs are nearly three times as likely as owners of other breeds to report musculoskeletal problems in their dogs. The most commonly reported musculoskeletal issues are cruciate ligament rupture, arthritis (especially in shoulders and elbows), hip dysplasia, and osteochondritis.