Complex sentence: Gertrude Hildreth was a psychologist with the Lincoln School at Teacher's College, Columbia then at Brooklyn College in New York and authored many books including the first book pertaining to school psychology titled, Psychological Service for School Problems written in 1930.
Split into simpler sentences: Gertrude Hildreth was a psychologist with the Lincoln School at Teacher's College, Columbia then at Brooklyn College in New York. She authored many books including the first book pertaining to school psychology titled, "Psychological Service for School Problems" written in 1930.