Complex sentence: It is found in nature as an alloy, mostly in platinum ores; its alloys with platinum, iridium and other platinum group metals are employed in fountain pen tips, electrical contacts and in other applications where extreme durability and hardness are needed.
Split into simpler sentences: It is found in nature as an alloy, mostly in platinum ores. Its alloys with platinum, iridium and other platinum group metals are employed in fountain pen tips, electrical contacts and in other applications where extreme durability and hardness are needed.