Complex sentence: Any e-mail address posted in public is likely to be automatically collected by computer software used by bulk emailers--a process known as e-mail address harvesting--and addresses posted on webpages, Usenet or chat rooms are particularly vulnerable to this.
Split into simpler sentences: Any e-mail address posted in public is likely to be automatically collected by computer software used by bulk emailers (a process known as e-mail address harvesting). Addresses posted on webpages, Usenet or chat rooms are particularly vulnerable to this.