Complex sentence: The park was originally known as "Knott's Camp Snoopy", and later, simply "Camp Snoopy", and was themed around the Charles M. Schulz "Peanuts" comic strip characters.
Split into simpler sentences: The park was opened as "Knott's Camp Snoopy", and later became "Camp Snoopy". Its theme was the Charles M. Schulz "Peanuts" comic strip characters.