How to divide my land into two deeds in my name itself?

Hi, I have purchased two plots from a developer. Through home loan, I am planning to build one house in each of the two plots. They had registered the land in my name in a single sale deed. They got the building approval plan showing both the houses in a single plan (adjust to one another) and the plan is different from what we have accepted. I asked them that since I am building two houses, I need separate building plans. But they are saying it is not possible since the both the plots are registered in single deed, only one plan can be provided. If it had been registered as two separate documents, then it is possible to get separate plan for separate houses. Kindly advice how to divide my sale deed into two sale deeds in my name itself.