Complex sentence: In many browsers control clicking opens a link in a new page, however with a lightboxed link this does not happen, opening the image in the same window inside a lightbox instead, which may not be what the user intended.
Split into simpler sentences: In many browsers control clicking opens a link in a new page. However, with a Lightbox link this does not happen, opening the image in the same window inside a lightbox instead, which may not be what the user intended.