Complex sentence: Svante August Arrhenius (19th February 1859--2nd October 1927) was a Swedish scientist, originally a physicist, but often referred to as a chemist, and one of the founders of the science of physical chemistry.
Split into simpler sentences: Svante August Arrhenius (February 19,1859-October 2,1927) was a Swedish scientist working on the border between physics and chemistry. Though sometimes classed as a physicist and sometimes as a chemist, he is best described as one of the founders of the science of physical chemistry.