Complex sentence: Compared to other metals, gold is malleable, ductile, rare and it is the only solid metallic element with a yellow color; it is easily melted, fused and cast without the problems of oxides and gas that are problematic with bronzes, for example.
Split into simpler sentences: Compared to other metals, gold is malleable, ductile, rare, and it is the only solid metallic element with a yellow color. It may easily be melted, fused, and cast without the problems of oxides and gas that are problematic with other metals such as bronzes, for example.