Original version:

You are requested to pay the premium on your subscription, which is now overdue. We hereby give notice that unless the premium on your subscription is paid within 30 days from the date of this notification, we intend to cancel the account with immediate effect.

(Flesch-Kincaid reading ease: college level. Around 33 per cent of adults can read at this level.)

Plain English version:

Please pay your subscription as it is overdue. Your subscription will be cancelled if you do not pay by 30 June.

(Flesch-Kincaid reading ease: 12- to 13-year-olds. Around 90 per cent of adults can read at this level. Plain language techniques include using familiar words, using an appropriate tone, and replacing the vague date with a concrete one.)