Original: The house in the park later became the Viceregal Lodge, the "out of season" residence of the Lord Lieutenant (also known as the Viceroy), where he lived for most of the year from the 1820s onwards.
Simplified: The house in the park then became the Viceregal Lodge, the "out of season" residence of the Lord Lieutenant (also known as the Viceroy), where he lived for most of the year from the 1820s onwards.