Complex sentence: The program was however delayed by about a month by late radiobarium shipments, as the one scheduled for 15 August was not delivered until mid-September; first test with radiobarium was fired on 22 September.
Split into simpler sentences: The program was however delayed by about a month by late radiobarium shipments, as the test scheduled for 15 August was not conducted until mid-September. The first test with radiobarium was fired on 22 September.