The latter step would largely offset the financial burden of annually pre-funding retiree health care, thus addressing a long-standing complaint by the USPS and its unions.

曹老师您好，该句介词短语部分of annually pre-funding retiree health care中 pre-funding retiree health care的逻辑主语如何分析？查了相关资料讲的是“介词+动名词”结构作定语，若所修饰名词不受名词所有格或物主代词修饰，则句子的主语就是动名词的逻辑主语。此句是否是例外？

另外addressing a long-standing complaint是结果状语，其逻辑主语是前面一句话的内容吗？