Complex sentence: It was bought by Rooplal Das and his brother Roghunath Das in 1835Jhey renovated this house hiring Martin and company, an architectural firm of Calcutta, who had also renovated Ahsan Manzil.
Split into simpler sentences: It was bought by Rooplal Das and his brother Roghunath Das in 1835. They renovated this house hiring Martin and company, an architectural firm of Calcutta, who had also renovated Ahsan Manzil.