Complex sentence: The organization can be a direct handler of the message, such as the author, the originating sending site or an intermediary along the transit path; or an indirect handler, such as an independent service that is providing assistance to a direct handler.
Split into simpler sentences: The organization can be a direct handler of the message, such as the author, the originating sending site or an intermediary along the transit path. It can also be an indirect handler, such as an independent service that is providing assistance to a direct handler.