Complex sentence: FBI agent Robert Graham (James Arness) is unable to identify the footprint, and it attracts the attention of Harold (Edmund Gwenn) and Pat Medford (Joan Weldon), a father/daughter team of entomologists from the Department of Agriculture.
Split into simpler sentences: FBI agent Robert Graham (James Arness) is unable to identify the footprint. It attracts the attention of Harold (Edmund Gwenn) and Pat Medford (Joan Weldon), a father/daughter team of entomologists from the Department of Agriculture.