"For" is a coordinating conjunction, like and , but , so , or and yet . Sentences can begin with a coordinating conjunction. The sentence you gave is very informal and very poor grammatically.
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"For" is a coordinating conjunction, like and, but, so, or and yet. Sentences can begin with a coordinating conjunction. The sentence you gave is very informal and very poor grammatically. It is not a proper example of this use of "for", for it is most commonly seen in very formal and literary texts.