Complex sentence: On December 1,1947, Commission chairman Gilmore Clarke wrote to Ross, saying that they had no objection to the obverse, in which they recognized Sinnock's "good workmanship".
Split into simpler sentences: On December 1,1947, Commission chairman Gilmore Clarke wrote to Ross. The Commission had no objection to the obverse, in which they recognized Sinnock's "good workmanship".