Complex sentence: Kirsty's story tells how and why her life changed due to the problems caused by neurofibromatosis and scoliosis, and how she has managed to overcome any obstacles put in her way.
Split into simpler sentences: Kirsty's story tells how and why her life changed due to the problems caused by Neurofibromatosis and Scoliosis. And how she's managed to overcome any obstacles put in her way.