Is there a heuristic to simplifying your message?

I have a solution I have developed but I keep finding my description of that it does for people to be way too complex and long.

I know there's a market for it. The solution is a tool I have been looking for in a number of jobs. Some of the features of my solution don't exist elsewhere and are things various bosses at various companies have asked my co-workers and I to find a solution for. I have even found people asking for this style solution on stackoverflow - unanswered for 4.5 years;
https://stackoverflow.com/questions/37173851/unit-testing-both-excel-formulas-and-vb-with-the-same-tool/61606254#61606254

The solution is essentially allowing people to work in a new way leveraging knowledge that they already have by extending MS Excel to behave differently which gives the user much greater effectiveness. It can even remove an analyst or developer from translating the spreadsheet into code, or greatly reduce the amount of work for one.

But getting the idea across initially requires me to be able to reduce my solution to an elevator pitch or similar.

Are there heuristics or rule-of-thumb to boil a complex and novel idea or concept down to something a "normal" person would understand in a sentence or two? (normal being someone not neck-deep in the minutiae of developing the solution)

Are there ways to train in how to do this -- books, courses, youtube...?

EDIT:
The idea isn't so complex, I've simply extended MS Excel to do things it couldn't before.

But it's the fact that Excel couldn't do this before that's difficult to describe as people appear to be comfortable/resolved to themselves that Excel doesn't and cannot do this.

In a genuine nutshell:-
FlyingKoala allows you to use Python to calculate the math you've expressed in Excel formulas.

But that's way too simple. From here the conversation always follows;
The reality of that is who cares..? Excel already calculates. Who on earth would want Python to do what Excel is already doing?

Then I add; You can write functions for yourself in Python. The response is; So? Other solutions do that already too (xlwings, datanitro, pyxll). Why write another one?

Thea answer is
FlyingKoala will do the conversion from Excel formulas to Python for you ("hands-free") and uses functions you've written in Python seamlessly. It will also provide the ability for you to use the Python generated from Excel formulas in Python generally. So the math you define in Excel and its formulas can become a "module" or "black-box" math component in Python without needing an analyst or developer to translate them.

FlyingKoala also provides the ability to write unit tests for Excel formulas. I meet resistance here too. Because people couldn't do this before FlyingKoala it's in their mind that they can't thoroughly test models written in Excel. People who write models and need to satisfy clients, managers, banks or auditors through demonstration that the model is calculating correctly need this.