Complex sentence: Dalton found that an atomic theory of matter could elegantly explain this common pattern in chemistry-in the case of Proust's tin oxides, one tin atom will combine with either one or two oxygen atoms.
Split into simpler sentences: Dalton found that an atomic theory of matter could elegantly explain this common pattern in chemistry. In the case of Proust's tin oxides, one tin atom will combine with either one or two oxygen atoms.