Okay, here’s a relatively simple one.  I did this about 7 years ago.  I came across an existing note for sale from a private lender liquidating their portfolio.  It was secure by a commercial building (owner occupied ) in an excellent location.  The remaining principal was about $450,000; the stated interest rate was 11%, and the note had 8 years to run with a balloon.  I offered $400,000 which was accepted, and my yield on the purchase price was about 12.75%.  
I know of many investors that would be more than happy with an 11% yield.  I sold half interest in the note for $225,000, which provided the 11% yield to the investor.  Since I was now in my half interest for $175,000 and was receiving interest on 1/2 the principal or $225,000, my yield was now about 15%. 
I also handled “servicing” the note for a 1% annual fee, decreasing the investors yield to 10% (they were still VERY happy with the yield and increasing my yield to 16%.  

This is a prime example of how investors ACTIVE in note investing obtain yields about 50% more than their PASSIVE counterparts.  If you have a $3,000,000 note portfolio, your return is (theoretically) $450,000 annually vs $300,000 as passive investor.