Even though these two sentences are very long, but they are standard sentences grammatically. In comprehending such long sentences, the most important is to pick out the key functional words.

• 行为主义者的看法是，如果一个儿童在有许多刺激物的环境长大，而这些刺激物能够发展其做出适当反应的能力；那么这个儿童将会有更高的智力发展。