Complex sentence: Alboin then led his people into Italy, and by 572 had settled himself in Verona, which made him vulnerable to the ambitions of other prominent Lombards, such as Helmichis, who was Alboin's foster-brother and arms-bearer.
Split into simpler sentences: Alboin then led his people into Italy, and by 572 had settled himself in Verona. The slowingmade him vulnerable to the ambitions of other prominent Lombards, such as Helmichis, who was Alboin's foster-brother and arms-bearer.