Complex sentence: Critics note, however, that Gann did not set down rules for determining how many points should be considered a single unit in such cases and hence that the positioning of the angles on a chart is entirely arbitrary and not scientific.
Split into simpler sentences: Critics note, however, that Gann did not set down rules for determining how many points should be considered a single unit in such cases. This leads opponents of Gann theory to say that the positioning of the angles on a chart is entirely arbitrary and not scientific.