Complex sentence: Both men played active roles in the company's early development prior to and after Elon Musk's involvement, with Eberhard the original CEO of Tesla until he was asked to resign in August 2007 by the board of directors.
Split into simpler sentences: Both men played active roles in the company's early development prior to and after Elon Musk's involvement. Martin Eberhard was the original CEO of Tesla until he was asked to resign in August 2007 by the board of directors.