A way I like to approach it is to have three broad sections (we use Confluence pages instead of slide decks where I am) :

1. A very brief list of 'headlines' - my latest was in the form of a lightweight persona aggregating our users' pain points

2. A fuller section with a brief listing of methodology ("we interviewed x people in y roles"), project goals, prior assumptions and main findings

3. An 'In Detail' section for the project team to dive into to answer all their 'what do they really mean by that?' questions. People less involved need only read the first bit; you've got to be incredibly keen to read to the end, but it's there if you want it (like an appendix on a traditional report).