Complex sentence: The new treatments for PD are in clinical trials and most of them are centered on gene therapy, with this, researchers expect to compensate the loss of dopamine or to protect the dopamine neurons from degeneration.
Split into simpler sentences: The new treatments for PD are in clinical trials and most of them are centered on gene therapy. With this, researchers expect to compensate the loss of dopamine or to protect the dopamine neurons from degeneration.