Complex sentence: The potential of the device was so obvious that the US group, informally known as the Microwave Committee, immediately switched their efforts to the magnetron, and had their own examples being built in US labs within weeks.
Split into simpler sentences: The potential of the device was so obvious that the US group, informally known as the Microwave Committee, immediately switched their efforts to the magnetron. They had their own examples being built in US labs within weeks.