Complex sentence: On May 14,1981 he became the first and so far only Romanian to fly in space (on Soyuz 40) and stayed eight days on the Salyut 6 space station doing scientific research and experiments, including exploration of Earth's magnetic field.
Split into simpler sentences: On May 14,1981 he became the first and so far the only Romanian to fly in space (on Soyuz 40). He spent eight days on the Salyut 6 space station doing scientific research and experiments, including exploration of Earth's magnetic field.