划分一下句子成分就容易理解一些了：
I really valued the insights (that they gave me into being on the receiving end of multinational marketing).我添加了that,that 引导的从句做insights的定语.
they gave me into (being on the receiving end of multinational marketing).into在这里是介词成份,引导后面括号中名词成份的短句.
be on the end of 是说作为......的终端
这样划分后,可以清楚了解句子的含义是：我认为他们（所给予我们作为国际市场接收终端）的眼光十分有价值.