Complex sentence: Freshly prepared lead has a bright silvery appearance with a hint of blue but tarnishes on contact with moist air, resulting in a dull appearance with a hue that depends on the prevailing conditions.
Split into simpler sentences: Freshly prepared lead has a bright silvery appearance with a hint of blue. It tarnishes on contact with moist air, and takes on a dull appearance the hue of which depends on the prevailing conditions.