Complex sentence: She had promised her Boston publisher another novel, but was so taken with northeast Florida that she produced instead a series of sketches of the land and the people which she submitted in 1872 under the title "Palmetto Leaves".
Split into simpler sentences: She had promised her Boston publisher another novel, but was so taken with northeast Florida that she produced instead a series of sketches of the land and the people. She submitted it in 1872 under the title "Palmetto Leaves".