Can someone help me? I am try to make a correct sentence with this.

With machetes, the explorers cut their way through the tall grasses to the edge of the canyon. Then they began to lay out the tapes for the survey.

What's wrong with what you have written?

Not sure if I should put a comma after canyon and then ad the word and or could it be correct.

It is correct as it is -- two complete sentences. Putting a comma in there would create a run-on (comma splice).

Thank You!!!

Sure, I can help you! If you're trying to make a correct sentence using the given information, you can build upon the provided sentence. Here's a suggestion:

Using their machetes, the explorers skillfully cut through the dense, towering grasses, forging a path towards the canyon's precipice. Once they reached the edge, they meticulously laid out the surveying tapes to commence their work.

To create this sentence, I added more descriptive language, expanded on the process of cutting through the grass with machetes, and emphasized the precision and accuracy involved in laying out the tapes for the survey. Keep in mind that there are many different ways to construct the sentence, so feel free to modify it to fit your specific needs or writing style.