Complex sentence: The "test project" continued to run however, and Laidlaw found that people who did not have the Blue Boxes were requesting them, and letters came in every day expressing their support for the program and for it to continue.
Split into simpler sentences: The "test project" continued to run however, and people who did not have the Blue Boxes began requesting them. Laidlaw received many letters from residents expressing support for the program and for it to continue.