Complex sentence: The empire consolidated under Harihara I and began to expand and prosper under Bukka Raya, the capital was established at the more defensible and secure location of Vijayanagara, on the south side of the river.
Split into simpler sentences: The empire consolidated under Harihara I and began to expand and prosper under Bukka Raya. Some time after its original establishment, the capital was established at the more defensible and secure location of Vijayanagara, on the south side of the river.