Complex sentence: With the free time Winnie has from not being with Amanda, she starts to bond with Dinah, a dorky girl from their grade who is thrilled to have a friend and spends as much time with Winnie as possible.
Split into simpler sentences: With the free time Winnie has from not being with Amanda, she starts to bond with a dorky girl from their grade, Dinah. Dinah is thrilled to have a friend and spends as much time with Winnie as possible.