Complex sentence: That same summer, Jones was replaced as bassist and lead vocalist by Lifeson's schoolmate Gary Lee Weinrib, who went by the name of Geddy Lee, "Geddy" representing the heavily accented pronunciation of his first name by his Jewish mother.
Split into simpler sentences: That same summer, Jones was replaced as bassist and lead vocalist by Lifeson's schoolmate Gary Lee Weinrib, who went by the name of Geddy Lee. The name Geddy was inspired by the heavily accented pronunciation of his first name by his Jewish mother.