Create a separate numbered section (let's say 4 for this example):
4. JSON Object Format
4.1 An artefact is a JSON Object with the value names and property types as defined in table 1.
table 1
Where you now have "See below for details" replace as appropriate with:
(see 4.2 Version) or (see 4.3 Common Format)
4.2 Version (so that it matches your order of values
table 2
4.3 Common Format (Cluster, Class, Sub-class, Element)
The Cluster, Class, Sub-class and Element sections have the same format. That format consists of the value names and data types defined in table 3:
table 3
The further text: Each activity is described fully by its cluster, class, sub-class, and element code numbers. When an activity is being used as a general term (or the detail is not sufficient to describe at all four levels) the upper levels can be used in place of the more specialized descriptions (by providing a zero value for the lower level code numbers). For example, Travel by sports car would be coded as cluster = 22, class = 2, subclass=1, element=1, while travel by land would be coded as cluster = 22, class = 2, subclass=0, element=0.
Needs to be broken into a separate paragraph following the format sections and the example needs to be indented and labeled as an example.