Complex sentence: Duke is also credited with pressurizing Merck to supply Invermectin free to all sufferers of River Blindness, this led to the creation of the Mectizan Donation Programme, to date more than half a billion doses have been given away.
Split into simpler sentences: Duke is also credited with pressuring Merck to supply Invermectin free to all sufferers of River Blindness, which led to the creation of the Mectizan Donation Programme. To date more than half a billion doses have been given away.