Complex sentence: A second form of neuroacanthocytosis entitled Levine-Critchley syndrome was discovered by the American internist Irvine M. Levine in 1960 and which he described in "Neurology" in 1964, and again in 1968.
Split into simpler sentences: A second form of neuroacanthocytosis, Levine-Critchley syndrome, was discovered by the American internist Irvine M. Levine in 1960. He described in "Neurology" in 1964, and again in 1968.