Complex sentence: System operators (sysops) at sites offering pseudonymity, such as Wikipedia, are not likely to build unlinkability into their systems, as this would render them unable to obtain information about abusive users quickly enough to stop vandalism and other undesirable behaviors.
Split into simpler sentences: System operators (sysops) at sites offering pseudonymity, such as Wikipedia, are not likely to build unlinkability into their systems. If they did, they would be unable to obtain information about abusive users quickly enough to stop vandalism and other undesirable behaviors.