Complex sentence: In February 2015 GSK announced that it would acquire GlycoVaxyn, a Swiss pharmaceutical company, for $190 million, and in June that year that it would sell two meningitis drugs to Pfizer, Nimenrix and Mencevax for around $130 million.
Split into simpler sentences: In February 2015 GSK announced that it would acquire GlycoVaxyn, a Swiss pharmaceutical company, for $190 million. In June 2015, the company announced it would sell two meningitis drugs to Pfizer, Nimenrix and Mencevax, for around $130 million.