Complex sentence: Harold R. Spira, BVSc MRCVS MACVSc HDA, most commonly referenced as Dr. Harry Spira, was an Australian veterinarian, geneticist and dog fancier who was instrumental in the development of dog breeding programs which used artificial insemination and frozen semen.
Split into simpler sentences: Harold R. Spira, BVSc MRCVS MACVSc HDA, usually known as Dr. Harry Spira, was a noted Australian veterinarian, geneticist and dog fancier. He was instrumental in the development of dog breeding programs that used artificial insemination and frozen semen.