Complex sentence: But in 1929 he returned to Cleveland and had a record of 21-10, with 100 strikeouts and a 3.60 earned run average; in 1930 his record rose to 25-13, with 143 strikeouts and a 3.31 ERA (second in the AL).
Split into simpler sentences: But in 1929 he returned to Cleveland and posted a 21-10 record with 100 strikeouts and a 3.60 earned run average. In 1930 his record rose to 25-13, with 143 strikeouts and a 3.31 ERA (second in the AL).