It is the interaction between people,rather than the events

我觉得您的标点符号没有错,整个句子的结构应该是这样的,that is the main 中的that和It is the interaction between people构成强调句,整个句子变形应为the interaction between people, rather than the events that occur in their lives,is the main focus of social psychology.所以此处that不是关系代词.它只是强调句的一个结构.整个句子不是定语从句.