Does the wording sound alright in this sentence.

War is the solution to the world's problems because global peace is
impossible to achieve. Nothing is better than having that basic
understanding on how in the end war would be justified and benefits
mankind.

If you were to read this aloud, putting a comma on either side of "in the end" would allow a breath, if that were necessary. At the very end, try a parallel construction = "war would be justified and mankind benefited/benefitted."

Sra

Should one of those benefited be benefits?????

No -- use benefited.

The wording in the sentence is acceptable, but the argument being presented is subjective and controversial.

If you're looking for feedback on the grammar and construction of the sentence, it appears to be well-written. However, the idea that war is the solution to the world's problems may be disputable and requires supporting evidence and logical reasoning to be persuasive.

To enhance the clarity and effectiveness of the sentence, you might consider rephrasing it and providing objective facts or examples to support your argument. Ensure that you consider multiple perspectives and counterarguments to present a comprehensive and balanced viewpoint.