Complex sentence: The Federal Bureau of Investigation also investigated Dwyer's claims regarding impropriety on behalf of FBI personnel, ultimately finding them to be lacking "in substance and specificity" and warranting "no further action".
Split into simpler sentences: The Federal Bureau of Investigation also investigated Dwyer's claims regarding impropriety on behalf of FBI personnel. They ultimately found Dwyer's claims to be lacking "in substance and specificity" and warranting "no further action".