Complex sentence: Ellen Redknap wrote under several names, mainly Erroll Collins, one book was published under the name Greame Grant Hawkins (to celebrate her Nephews birth) and possibly she wrote under the name Clyde Marfax.
Split into simpler sentences: Ellen Redknap wrote under several names, mainly Erroll Collins. One book by her was published under the name Greame Grant Hawkins (to celebrate her Nephews birth) and possibly she also wrote under the name Clyde Marfax.