Complex sentence: He worked as a graduate management trainee with P&O for a year until 1978 when he was appointed as a ship broker with Anderson Hughes where he remained until his appointment as the managing director of GNI Freight Futures in 1984, in which capacity he served until 1992.
Split into simpler sentences: He worked as a graduate management trainee with P&O for a year until 1978, when he was appointed as a ship broker with Anderson Hughes. He remained there until his appointment as the managing director of GNI Freight Futures in 1984, in which capacity he served until 1992.