The part of the sentence "background on why" is correct and usable in written English.
You can use it when you want to provide information in order to explain why a certain event or situation occurred. For example, "We need to discuss the background on why our team has been underperforming lately."
Oprah will recommend one of her favorite products, and give you background on why she picked the item this year.
Some good background on why the US side move around so much here.
First, some background on why A123 was in the running in the first place.
Provide background on why and how the partnership was developed and established.
(More background on why he should resign can be found in my blog post on Baseline Scenario).
I read scientific textbooks about poison and a lot of psychological background on why people would poison.
The An Introduction to Exposure Maps document provides background reading on why weighted exposure maps are important, and under what conditions they produce meaningful results.
This response, sometimes called the "two-minute pitch" or "elevator speech" should give a quick introduction to your background, focusing on why you are a good fit for this position in this organization.
Therefore, our objective was to provide empirical and methodological background of why and how to investigate the specific effect of the provider on patients' health outcomes.
The purpose of this paper is to present a theoretical background for why a focus on the researcher should be a critical methodological concern in gerontology which engages with ethnicity, specifically illustrating its relevance through examples in a cross-ethnic and cross-generational context.
Some background on ASAP and why it is important: Archiving Student Activism at Princeton is an initiative launched last year in December 2015 by the Princeton University Archives to collect, preserve, and make accessible records of student activism.
