Complex sentence: Mario Visintini, MOVM, (26 April 1913--11 February 1941), was the firstRegia Aeronautica ace of World War II. In recognition of his flying skill and meticulousness, Visintini was nicknamed "cacciatore scientifico" (scientific fighter pilot).
Split into simpler sentences: Mario Visintini, MOVM, (26 April 1913--11 February 1941), was the first Regia Aeronautica World War II ace. For his skill and meticulousness, Visintini was nicknamed "cacciatore scientifico" (scientific fighter pilot).