"When I put up the first [incredibly busy bullet point] I start of with this introduction before I take people through the slide"

Usually, these introductions are great. They come out naturally, in a conversational style. Next time:

1. Use that introduction as the opening of your presentation, add a visual slide here and there to support the story. And don't stop there, finish the entire presentation in that style
2. Second best option. Put in a black slide before your busy opening slide and tell that introduction without encouraging people to start reading your bullet points.

Image: New Zealand rugby team performing the "haka" in 1932