Clean Up Bad Audio And Provide Instruction On How It Was Done

Hello, I'm looking for someone to help me make a sound file sound much better. I am also interested in the detailed instructions of how it was done. I have an audio file of a person speak but there is a lot of background noise and sounds that covers their voice. I would like to make the sound file better so I can hear the persons voice much clearer with much less backgound sound and noise. I'm looking for a method that can be done easily as well. Attached is the audio file. If you need more info please let me know. Thank you.