Complex sentence: The optogenetic toolkit has proven pivotal for the field of neuroscience as it precise manipulation of neuronal excitability however this technique has been shown to extend outside neurons to an increasing number of proteins and cellular functions.
Split into simpler sentences: The optogenetic toolkit has proven pivotal for the field of neuroscience as it allows precise manipulation of neuronal excitability. Moreover, this technique has been shown to extend outside neurons to an increasing number of proteins and cellular functions.