Complex sentence: Preliminary laboratory investigations using retinoscopy of 240 dogs found myopic problems with varying degrees of refraction errors depending on the breed; in the case of breeds of German Shepherd, Rottweiler and Miniature, the refraction errors were indicative of myopia.
Split into simpler sentences: Preliminary laboratory investigations using retinoscopy of 240 dogs found myopic problems with varying degrees of refraction errors depending on the breed. In the case of breeds of German Shepherd, Rottweiler and Miniature, the refraction errors were indicative of myopia.