Here we have an obvious typo in the 1906 LDS large-print edition; the present-tense yieldeth was replaced by the past-tense yielded, perhaps because of the following past participial verb forms that could be misinterpreted as simple past-tense forms (“mocked and scourged and cast out and disowned”). This error was not continued in any of the subsequent LDS editions. In the original text, we have three conjoined predicates for which each verb is in the present tense (“suffereth … yieldeth ... suffereth”).
Summary: Maintain the present-tense form yieldeth in Mosiah 15:5.