Here are some presentations I've produced that I think are good examples of the slide presenter's craft.
Explaining a complex process of any kind is going to be difficult without some form of visual backup. This slide helps to break down each part of the process as the speaker is describing it.
Hitting the audience with a bunch of figures is all well and good but the comparison you are trying to make is not going to be clear in their mind if they are just hearing you talk. This sequence of slides clearly illustrates the changes in the amounts over the decades and helps to clarify what the presenter is saying.
Here are five slides that show how data can be presented creatively. The charts also use effective animation to build up as the speaker is talking.
This presentation ticks all the boxes as far as simplicity is concerned. There's no superfluous elements on the slides. The only things that appear on the slides are things that are related to getting the message across.
A small part of a speech given by Phillip Khan-Panni for which I produced the slides. Like this one, all the slides in the presentation were kept as simple as possible and supported Phillip in reinforcing his message.