As per the question, the given sentence would be characterized as an 'incomplete' sentence as it is syntactically and semantically fragmented. It comprises of two subordinate clauses which fail to convey a coherent thought. Grammatically, a subordinate clause is accompanied by an independent clause to accomplish its meaning but here the sentence involves two subordinate clauses back to back which leaves the meaning unaccomplished.
In order to rectify the error, the second subordinate conjunction(i.e. 'before') could be removed to make the latter clause of the sentence independent and add a comma(,) after the subordinate clause so that they together(subordinate clause followed by the principal clause) convey a coherent thought(syntactically and semantically appropriate). It read as:
'After copying the information, you begin the following steps.'
