Complex sentence: In the 1980s, Rothschild took a leading role in the international phenomenon of privatisation, where the company was involved from the beginning and developed a pioneering role which spread out to over thirty countries worldwide.
Split into simpler sentences: In the 1980s, Rothschild took a leading role in the international phenomenon of privatisation. The company was involved from the beginning and developed a pioneering role which spread out to more than thirty countries worldwide.