Complex sentence: But she persisted and on June 8 of that year was hired by another Byoir executive as a publicist in its Radio-TV Department, she became head of that department, and Byoir's youngest vice president in 1956.
Split into simpler sentences: But she persisted and on June 8 of that year was hired by another Byoir executive as a publicist in its Radio-TV Department. She became head of that department, and Byoir's youngest vice president in 1956.