Complex sentence: The war ended in 1918, before Fitzgerald was ever deployed, and upon his discharge he moved to New York City hoping to launch a career in advertising that would be lucrative enough to convince Zelda to marry him.
Split into simpler sentences: The war ended in 1918, before Fitzgerald was ever deployed. Upon his discharge he moved to New York City hoping to launch a career in advertising that would be lucrative enough to convince Zelda to marry him.