Extension of registration period for eligible trusts to ten years where income threshold is met and application qualifies. Where an application is made under specified sub-clauses and the trust or institution's total income, without giving effect to charity-specific exemptions, did not exceed a prescribed income threshold in each of the two previous years preceding the application, the applicable period in the registration provision is to be read with ten years substituted for the earlier period; additionally, certain words are omitted from the Explanation's clause (g).