他一下子就闻到了一股不好的气味,这使他相信了我所说的话.
分析长难句先找动词.此句为was greeted by convinced was telling
然后顺着动词找动词的主宾 he was greeted by an unpleasant smell
which convinced him that...
I was telling the truth
然后根据第三句在第二句中做的是convinced的直接宾语,可知that 引导宾语从句
根据第二句中which指代的就是这股难闻的气味,可知which引导定语从句,