Complex sentence: While the earliest known Japanese animation dates to 1917, and many original Japanese animations were produced in the ensuing decades, the characteristic anime style developed in the 1960s--notably with the work of Osamu Tezuka--and became known outside Japan in the 1980s.
Split into simpler sentences: While the earliest known Japanese animation dates to 1917, and many original Japanese animations were produced in the ensuing decades. The characteristic anime style developed in the 1960s--notably with the work of Osamu Tezuka--and became known outside Japan in the 1980s.