Complex sentence: Many Gepids followed Alboin to Italy (see Paulus Diaconus), but many remained, in 630 Theophylact Simocatta reports that Byzantine Army entered the territory of the Avars and attacked a Gepid feast capturing 30,000 Gepids (they met no Avars).
Split into simpler sentences: Many Gepids followed Alboin to Italy (see Paulus Diaconus), but many remained. In 630, Theophylact Simocatta reported that the Byzantine Army entered the territory of the Avars and attacked a Gepid feast, capturing 30,000 Gepids (they met no Avars).