Complex sentence: In her Yale laboratory, Horsley has studied the cellular and molecular pathways involved in skin tissue development and maintenance, as well as the relationship between fat cells in the skin, wound healing, regeneration of hair follicles, and the formation of keratinocytes during embryonic development.
Split into simpler sentences: In her Yale laboratory, Horsley has studied the cellular and molecular pathways involved in the development and maintenance of skin tissue. She has researched the relationship between fat cells in the skin, wound healing, and regeneration of hair follicles, and the formation of keratinocytes during embryonic development.