Complex sentence: The presence of such a gap suggested communication via chemical messengers traversing the synaptic cleft, and in 1921 German pharmacologist Otto Loewi (1873--1961) confirmed that neurons can communicate by releasing chemicals.
Split into simpler sentences: The presence of such a gap suggested communication via chemical messengers traversing the synaptic cleft. In 1921 German pharmacologist Otto Loewi (1873--1961) confirmed that neurons can communicate by releasing chemicals.