Complex sentence: Laura Joplin, Janis'younger sister, said in an interview that her sister went straight to her parents' home in Port Arthur, Texas, following Woodstock, was incredibly vibrant and happy after coming home, and really loved the festival.
Split into simpler sentences: Laura Joplin, Janis's younger sister, said in an interview that her sister went straight to her parents in Port Arthur, Texas, following Woodstock. She was incredibly vibrant and happy after coming home and really loved the festival.