Complex sentence: Iron may be the most common as it accounts for 90% of all refined metals; platinum the most ubiquitous given it has been said to be found in, or used to produce, 20% of all consumer goods.
Split into simpler sentences: Iron may be the most common as it accounts for 90% of all refined metals. Platinum may be the most ubiquitous given it is said to be found in, or used to produce, 20% of all consumer goods.