Complex sentence: The two concerts on 1 August 1971 were highly successful-with a cheque for US $243 418.50 being immeidiately sent to UNICEF for relief-and all involved were pleased with a job well done.
Split into simpler sentences: The two concerts on 1 August 1971 were highly successful, with a cheque for US $243,418.50 being immediately sent to UNICEF for relief. All involved were pleased with a job well done.