Final answer:
The development that relates to the form of the pyramid complex at Giza is the Valley temples.
Step-by-step explanation:
A development around the beginning of the 4th dynasty in Egypt that seemed to relate to the form of the pyramid complex at Giza is the Valley temples. These Valley Temples were used as places of worship for many years after the king's death, and they contained images of the king to serve as a focus for worship.