Complex sentence: He also affected her style of writing for a time; based on his example, she began writing in a more formal syntax, but she eventually became irritated with the restrictions and reverted back to her freer, more natural style.
Split into simpler sentences: He also affected her style of writing for a time. Based on his example, she began writing in a more formal syntax, but she eventually became irritated with the restrictions and reverted back to her freer, more natural style.