Your slides are there to support the speaking components of your presentation, not to replace it. If your slide contain too much information, like full sentences or paragraphs, then your audience members won't be able to help but read the slides instead of listening to you. Also it can be boring.
Instead, use slides to enchance keywords and show visuals while you stand up there and do the real work, telling a stroy and describing your data.
When it comes to your slide text, focus on the main phrases of a bullet point and cover details verbally.