What english translation of the Bible is easy to understand and is the most accurate?

The reason that the New World Translation was printed was so that it would be without spot by creeds or traditions. It was meant to be a literal translation that faithfully presented what is in the original writings and a translation that would be clear and understandable to modern-day readers.

As for it's accuracy, the New World Translation has been found to be "one of the most accurate English translations of the New Testament currently available" and is "the most accurate of the [8 major] translations compared." - Truth in Translation: Accuracy and Bias in English Translations of the New Testament by Jason BeDuhn, associate professor of religious studies at Northern Arizona University, in Flagstaff, Arizona

Also see Comments made by Professor Benjamin Kedar of Israel concerning THE NEW WORLD TRANSLATION OF THE HEBREW SCRIPTURES.

For more, see
How does the accuracy of the New World Translation Bible compare to other translations?

How accurate is the NWT?

And
Where Can I Find The New World Translation Online?