Complex sentence: He was omitted for the Fifth Test because the selectors wished to trial other possible choices for the 1948 tour of England, so ended the series with 209 runs at an average of 52.25, making him the third highest scorer as Australia won 4--0.
Split into simpler sentences: He was omitted for the Fifth Test because the selectors wanted to trial other candidates for the 1948 tour of England. Morris ended the series with 209 runs at a batting average of 52.25, making him the third highest scorer as Australia won 4--0.