Complex sentence: Gutenberg developed an oil-based ink that would better adhere to his metal type, his ink was primarily carbon, but also had a high metallic content, with copper, lead, and titanium predominating.
Split into simpler sentences: Gutenberg developed an oil-based ink that would better adhere to his metal type. His ink was primarily carbon, but also had a high metallic content, with copper, lead, and titanium predominating.