Complex sentence: He used the electric ray electric organ that is homologous to the neuromuscular junction as a model system for cholinergic synaptic transmission as it permitted parallel electrophysiological stimulation and recording and the biochemical and electron microscopic analysis of the outcome of the synaptic activation on the synaptic vesicle compartment.
Split into simpler sentences: He used the electric ray electric organ that is homologous to the neuromuscular junction as a model system for cholinergic synaptic transmission. This sytsem it permitted parallel electrophysiological stimulation and recording and the biochemical and electron microscopic analysis of the outcome of the synaptic activation on the synaptic vesicle compartment.