Complex sentence: He has been folding origami since he was ten, and tends to create whimsical and ridiculous models, such as his "Man Swatter" and "BARF Bag".
Split into simpler sentences: He has been folding origami since he was ten. He creates his own origami designs which tend to be whimsical and ridiculous, such as his "Man Swatter" and "BARF Bag".