Original sentence: Shortly after his death in August 28, 430, they captured the city under King Geiseric after an 18-month siege in 431 and made it the capital of the Vandal kingdom in Northern Africa between 431 and 439
Edited sentence: Shortly after his death on August 28, 430, they captured the city under King Geiseric after an 18-month siege in 431 and made it the capital of the Vandal kingdom in Northern Africa between 431 and 439