Complex sentence: It was flown to the ISS aboard STS-132 on May 14,2010 aboard and was connected to the ISS on May 18; the hatch connecting Rassvet with the ISS was opened on May 20.
Split into simpler sentences: It was flown to the ISS aboard STS-132 on May 14,2010 aboard and was connected to the ISS on May 18. The hatch connecting Rassvet with the ISS was opened on May 20.