Complex sentence: The IP profile mechanism imposes an upper limit on the rate at which data destined for the user, and this rate restriction is imposed at the point where inbound data enters the BT Wholesale IP network from the Internet.
Split into simpler sentences: The IP profile mechanism imposes an upper limit on the rate at which data destined for the user is transmitted. This rate restriction is imposed at the point where inbound data enters the BT Wholesale IP network from the Internet.