Complex sentence: The cut itself would often be made to produce a wavy or serrated edge, in order to further reduce the scope for forgery, and this practice gave rise to the document description "indenture", since these edges would be said to be "indented".
Split into simpler sentences: The cut itself would often be made to produce a wavy or serrated edge, to reduce the possibility of forgery. This practice gave rise to the document description "indenture", since these edges would be said to be "indented".