Complex sentence: Since then, OriGene has expanded its focus to become a "comprehensive toolbox" for gene-based research products, developing full-length human proteins from human cells and monoclonal antibodies.
Split into simpler sentences: Since then, OriGene expanded its focus on becoming a "comprehensive toolbox" for gene-based research products. This move was followed by the development of full-length human proteins from human cells and the development of monoclonal antibodies.