GSDer is asking if you have installed a different SMS application other than the default which is simply called "Messaging". I believe the default behavior for the messaging app is after a SMS message gets past a certain size it breaks large messages into multiple messages. I do not typically use SMS to send long messages and thus have not seen this recently, but I have seen it in the past when sending long messages. If this is what you are referring to, it is normal for SMS messages.