Complex sentence: In 1948, a motorized aircraft, WEL-X was made by Wiweko Soepono using Harley Davidson engine, registered as RI-X. This era marked with rise of several aeromodeling club.
Split into simpler sentences: In 1948, a motorized aircraft, WEL-X was built by Wiweko Soepono utilizing a Harley Davidson engine. The small craft was registered as RI-X. This era marked the rise of several aeromodeling club.