Complex sentence: Forest was an enthusiastic letter-writer, corresponding both with her readers and literary figures such as GB Stern Heazlewood, Anne "The Marlows and Their Maker", Girls Gone By Publishers, 2007.
Split into simpler sentences: Forest was an enthusiastic letter-writer, corresponding both with her readers and literary figures such as GB Stern. Anne Heazlewood, "The Marlows and Their Maker", Girls Gone By Publishers, 2007.