Complex sentence: Hillis concluded that no single source of timing could meet the requirements, so in a compromise the clock will use an unreliable but accurate timer to adjust an inaccurate but reliable timer, creating a phase-locked loop.
Split into simpler sentences: Hillis concluded that no single source of timing could meet the requirements. As a compromise the clock will use an unreliable but accurate timer to adjust an inaccurate but reliable timer, creating a phase-locked loop.