Complex sentence: Sheepskin boots were reportedly being manufactured in 1933 by "Blue Mountains Ugg Boots" of New South Wales, and Mortels Sheepskin Factory have stated that they began manufacturing the boots in the late 1950s.
Split into simpler sentences: Sheepskin boots were reportedly being manufactured in 1933 by "Blue Mountains Ugg Boots" of New South Wales. According to Mortels Sheepskin Factory, they began manufacturing the boots in the late 1950s.