Complex sentence: In 1998, Laurent Kabila offered Billy a chance to lead state-owned Gecamines, which despite his initial reluctance he finally accepted, and in doing so successfully turned around the fortune of the company by cutting costs and improving efficiencies.
Split into simpler sentences: In 1998, Laurent Kabila offered Billy a chance to lead state-owned Gecamines. Despite initial reluctance, he finally accepted, and in doing so, successfully turned around the fortunes of the company by cutting costs and improving efficiencies.