Kyrsybski has pointed out that signal reactions, instantaneous and
unmediated, if undifferentiated according to the appropriateness of the
situation, reflect immature, impulsive personalities, while the development
of the ability to delay response will permit modified, thoughtful symbol
behavior, a characteristic of the mature person.
好长的句子！感觉应该是被分割了？！
麻烦各位大大帮忙还原成原句！谢谢！

第一和第二个逗点之间是修饰signal reactions的形容词；第三个逗点隔开if子句，immature和modified后面的逗点都是and隔开两个形容词；personalities后面逗点隔开while子句；最后的逗点是symbol behaviour的同位语。