Complex sentence: He also painted a double portrait of Mrs. Walker with Mrs Meirs; and a posthumous portrait of William Weightman, which was exhibited at the Corcoran Gallery in Washington and in Philadelphia in 1908.
Split into simpler sentences: He also painted a double portrait of Mrs. Walker with Mrs Meirs. A posthumous portrait of William Weightman was also commissioned; it was exhibited at the Corcoran Gallery in Washington and in Philadelphia in 1908.