英语句子成分分析But it pains me," I said,"to find that you both have

整句是it pains me to find that you both have been panhandling so long that it no longer embarrasses you.
it做形式主语,真正的主语是后面的不定式to find that you both have been panhandling so long that it no longer embarrasses you.
to find that 中的that引导的从句是做find的宾语从句,so long that 中的that 是前面that 从句中的状语从句.

to find that 中的that引导的是宾语从句
so long that 中的that 引导的是结果状语从句

to find that 中的that引导的是宾语从句，so long that 中的that 引导的是结果状语从句。