Complex sentence: A recent study discovered that the application of certain moisturizers increases the incidence of skin cancer in high-risk mice, though it should be noted that these animals were subjected to UVB radiation in high doses over a long period of time prior to application of moisturizers.
Split into simpler sentences: A recent study discovered that the application of certain moisturizers increases the incidence of skin cancer in high-risk mice. Note: these animals were subjected to UVB radiation in high doses over a long period of time prior to application of moisturizers.