A biomechanic films an athlete in action and then digitizes her performance, recording the motion of every joint and limb in three dimensions. ● 分析：

　　本句的主句为“A biomechanic films an athlete in action and then digitizes her performance”;

　　“recording the motion of every joint and limb in three dimensions”为现在分词短语做状语。

　　● 题目：

　　That understanding took the later analysis of biomechanics specialists, who put their minds to comprehending something that was too complex and unorthodox ever to have been invented through their own mathematical simulations. (剑4, test4 passage 1)

　　● 分析：

　　本句较长，主句为“That understanding took the later analysis of biomechanics specialists”;

　　“who put their minds to comprehending something”为定语从句，做biomechanics specialists 的定语，关系词为who;

　　“that was too complex and unorthodox ever to have been invented through their own mathematical simulations”也是定语从句，做something的定语，关系词为that。