Complex sentence: Subsequently, the Gepids migrated further to the south during the 2nd century and were reported in the mountains north of Transylvania by the end of the 3rd century, when they participated with the Goths in an invasion of Dacia.
Split into simpler sentences: Subsequently, the Gepids migrated further to the south during the 2nd century and were reported in the mountains north of Transylvania by the end of the 3rd century. In the 3rd century, the Gepids participated with the Goths in an invasion of Dacia.