Complex sentence: The neurogenesis appears to be mediated by activation of the 5-HT 1A receptor, as co-administration with the 5-HT 1A antagonist WAY-100,635 abolished the effect.
Split into simpler sentences: The neurogenesis appears to be mediated by activation of the 5-HT 1A receptor. Co-administration with the 5-HT 1A antagonist WAY-100,635 abolished the effect.