Complex sentence: He started his professional career as the assistant to the board of management at PWA Papierwerke Waldhof-Aschaffenburg AG. After having completed his PhD in Economics, he became a member of Roland Berger Strategy Consultants in 1989 and was elected Partner in 1992.
Split into simpler sentences: He started his professional career as the assistant to the board of management at Papierwerke Waldhof-Aschaffenburg AG (PWA). After completing his PhD in economics, he became a member of the company then called Roland Berger Strategy Consultants in 1989, and was elected partner in 1992.