Complex sentence: He co-authored the books Computer Animation Primer, Armchair BASIC, and Pascal Primer, which led to him being one of the founding members of the Games Division at Lucasfilm (now LucasArts Entertainment Company).
Split into simpler sentences: He co-authored the books Computer Animation Primer, Armchair BASIC, and Pascal Primer. David's books led to him being hired as a founding member of the Games Division at Lucasfilm (now LucasArts Entertainment Company).