Dr Simonsohu speculated that an inability to consider the big picture was leading decision-makers to be biased by the daily samples of information they were woking with.
你看,整句就是Dr simonsohu speculated.后面跟了个宾语从句.
最重要的是宾语从句里面的结构,其实从句的主体是
inability（主语） was leading（谓语） decision makers（宾语）.
什么样的inability(能力缺乏)呢?to consider the big piture(考虑大局观的),也就是说 没有考虑大局的能力.所以这部分是修饰主语的.
leading decision-maker(导致决策者).
决策者会怎样?to be biased by the daily samples of information they were working with .(会被每天工作的时候,看到的信息样本而表现的不偏颇（biased）).这部分是修饰宾语的.
楼主您明白了嘛?