Complex sentence: One study showed no evidence that covering a small wound with Polysporin provided any benefit greater than that of simple petroleum jelly, while another study showed that minor wounds treated with Neosporin showed a "significantly" decreased the rate of infection.
Split into simpler sentences: One study showed no evidence that covering a small wound with Polysporin provided any benefit greater than that of simple petroleum jelly. Another study showed that minor wounds treated with Neosporin showed a "significantly" decreased the rate of infection.