Probably not. I'd hesitate in trying to produce a summary intended for a high-school class, let alone a 5th-grade class that is unlikely to have been exposed to the differences between a personal exemption, a deduction, and a credit. If I had to attempt that, I'd say:
* Most people will pay less income tax.
* Fewer people will need to fill out Schedule A (itemized deductions) because there are fewer itemized deductions and the standard deduction was increased.
* Those who own small businesses get a new tax deduction.
That's extremely simplified, but there is no good middle point between that and the IRS's 14 page "brief" guide.
https://www.irs.gov/pub/irs-pdf/p5307.pdf