Complex sentence: The most important member of the auxin family is indole-3-acetic acid (IAA), which generates the majority of auxin effects in intact plants, and is the most potent native auxin.
Split into simpler sentences: The most important member of the auxin family is indole-3-acetic acid (IAA). IAA generates the majority of auxin effects in intact plants, and is the most potent native auxin.