Complex sentence: In a computer a typical heat-generating component may be manufactured with a flat surface; a block of metal with a corresponding flat surface and finned construction, sometimes with a fan attached, is clamped to the component.
Split into simpler sentences: In a computer, a typical heat-generating component may be manufactured with a flat surface. A block of metal with a corresponding flat surface and finned construction, sometimes with an attached fan, is clamped to the component.