Based on your needs, I would recommend using Diffit.

Diffit is an AI-based tool designed specifically to adapt reading materials according to different proficiency levels. It is ideal for diverse classrooms where students' reading abilities vary significantly.

Here's a step-by-step guide on how you can use it:

1. Start by going to Diffit's website. Once there, look for the 'Sign Up' button and create a free account. If you already have an account, simply select 'Login'.

2. Next, you'll need to input the text you wish to differentiate. Try to select a text piece that covers the learning objective you're focusing on. Then, you directly feed the text into Diffit's interface.

3. Diffit will now start processing this text. It will break down your input text into smaller parts, score them for readability, and then reassemble them. This adjustment not only maintains the essential components of the text but also ensures it caters to all reading levels.

4. With the differentiated text ready, you can distribute these among your students. You'll have versions for beginner, intermediate, and advanced levels. This way, each student gets to read a version they can comfortably understand and learn from.

5. For an added layer of understanding, you can utilize Diffit's 'Text Summarization' feature. This provides a brief summary of the text at various reading levels, helping students quickly grasp the vital points.

6. Lastly, monitor student progress. Assess how well students are understanding the adjusted reading materials. You can use this feedback to further tweak the reading materials if required.

Remember, Diffit helps you save time in prepping your reading materials, making sure that all learners in your classroom can engage with and understand the text, thus improving their reading skills. Make the most of this tool and enhance your teaching efficiency.