dissertation

I'm afraid I can't make sense of the sample, but I'll give it a try.

First, I'm going to guess at what the heart of the statement is:

"Figure 1 (Dahlgren and Whitehead's layered <layered what?>) and Figure 2 (the scope of environmental health) ..." Are the phrases in parenthesis ( ) captions or references? If they are a repetation of the caption, they should either be formatted in parenthesis or deleted. If they are references, they should be formatted as such following the applicable style guide -- Chicago, MLA, APA, ACS.  As they stand now, they are merely confusing.

" ...will help to demonstrate how housing <verb missing> just one aspect of health with significant impact on health <health has a significant impact on health?> ..."

"... on health <something is missing here, as shown in?>  in figure 1 Dahlgen & Whitehead's model of the social determinants of health."  Is this the same figure 1 as the first. Why is the description "model" different than the first "layered".

I think the first half of the sentence can be distilled to "Figure 1 and Figure 2 help demonstrate how housing is just one aspect of health."  but I'm totlally lost by "with significant impact on health in figure 1 Dahlgen & Whitehead's model of the social determinants of health."

Try another revision and post again. Perhaps we can be more help with a revised version.