Complex sentence: Instead he worked as a reporter at the "New York Daily Mirror" along with Arthur Brisbane's son, Seward Brisbane; in 1939, the two founded a newspaper together, "The Civil Service Leader", targeting public employees as an audience.
Split into simpler sentences: Instead he worked as a reporter at the "New York Daily Mirror". In 1939, along with Arthur Brisbane's son, Seward Brisbane; he founded a newspaper called, "The Civil Service Leader", targeting public employees as an audience.