the researchers theorize that moths, mistaking nighttime lights for the Sun, continually try to reorient their bodies while flying near such lights.

the researchers’ theory is that moths mistake nighttime lights for the Sun, continually trying to reorient their bodies while flying near such lights.

moths mistake nighttime lights for the Sun and continually try to reorient their bodies while flying near such lights, the researchers theorize. 

moths continually try to reorient their bodies while flying near nighttime lights, the researchers theorize, mistaking such lights for the Sun.