Complex sentence: In 1805 Thomas Jefferson recruited a group of musicians Sicily to form a military band, later to become the nucleus of the U.S. Marine Band; among them was the young Venerando Pulizzi who, in 1816, became the first Italian director of the Band.
Split into simpler sentences: In 1805 Thomas Jefferson recruited a group of musicians from Sicily to form a military band, later to become the nucleus of the U.S. Marine Band. The musicians included the young Venerando Pulizzi who, in 1816, became the first Italian director of the Band.