Complex sentence: He was the first person to see capillaries in animals, and he discovered the link between arteries and veins that had eluded William Harvey and Malpighi has been the earliest person to observe red blood cells under a microscope.
Split into simpler sentences: He was the first person to see capillaries in animals, and he discovered the link between arteries and veins that had eluded William Harvey. Malpighi was the earliest person to observe red blood cells under a microscope.