Why won't my 5c send a message as MMS when it's a long message to a non iPhone user?

Whenever I type a LONG message to an SMS user (says Text Message in the messaging "box") my 5c won't convert to MMS and the recipient gets the message in dozens of out of order messages instead of the whole fluid message. I have MMS on in Settings. What can I do and why is it doing this?

Try turning your phone off for for a while, then turn it back on. See if that helps.

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