Complex sentence: After the war, Foster returned to Indiana and (in addition to his legal practice) edited the "Evansville Daily Journal", which he and used the paper to promote the Republican Party from 1865 to 1869.
Split into simpler sentences: After the war, Foster returned to Indiana and (in addition to his legal practice) edited the "Evansville Daily Journal". He used the paper to promote the Republican Party from 1865 to 1869.