Before
The amount of any such donation is limited to an amount that is less than one percent of that organization’s annual charitable receipts and is less than one percent of ABC Corp.’s annual charitable contributions. (35 words)
Before, with commentary
The amount of any such donation is limited to an amount that is less than [“The amount…is limited to an amount” is awkward. And do you really need eight words to say “cannot exceed”?] one percent of that organization’s annual charitable receipts and is less than [if the “cannot exceed” idea is at the beginning of the sentence, you can eliminate these words] one percent of ABC Corp.’s annual charitable contributions.
After
No charitable donation can exceed one percent of the recipient’s annual charitable receipts or one percent of ABC Corp.’s annual charitable contributions. (22 words)