Complex sentence: Weiss is remembered for pioneer systematic research of the spinal marrow, medulla oblongata and basal ganglia, and in 1881 showed a causal relationship between tetany and the removal of goitre.
Split into simpler sentences: Weiss is remembered for pioneer systematic research of the spinal marrow, medulla oblongata and basal ganglia. In 1881 he showed a causal relationship between tetany and the removal of goitre.