Complex sentence: General intellect, a crucial factor in production according to Karl Marx in his "Grundrisse", is a combination of technological expertise and social intellect, or general social knowledge-increasing importance of machinery in social organization.
Split into simpler sentences: General intellect, according to Karl Marx in his "Grundrisse", became a crucial force of production. It is a combination of technological expertise and social intellect, or general social knowledge-increasing importance of machinery in social organization.