Complex sentence: The earliest use of the term began among a group of teenagers in San Rafael, California in 1971, calling themselves the Waldos, because "their chosen hang-out spot was a wall outside the school".
Split into simpler sentences: The earliest use of the term began among a group of teenagers in San Rafael, California in 1971. Calling themselves the Waldos, because "their chosen hang-out spot was a wall outside the school".