Complex sentence: In January 2002, Icos signed an agreement with Eos Biotechnology, under which Icos would produce Eos's most promising monoclonal antibody candidate, and Eos would have non-exclusive rights to Icos's CHEF1 enhanced mammalian protein expression technology.
Split into simpler sentences: In January 2002, Icos signed an agreement with Eos Biotechnology. Under the agreement, Icos would produce Eos's most promising monoclonal antibody candidate, and Eos would have non-exclusive rights to Icos's CHEF1 enhanced mammalian protein expression technology.