If the other person is not giving you money any more, then they are not a sponsor now. See this:
Financial Sponsor - The individual, government, company or agency who is willing and able to financially support the international student. Financial support includes tuition, books, supplies, fees and living expenses for the duration of studies at the institution. More than one (1) sponsor per student is allowed.
Is the person you were staying with before providing any financial support? If not, you can change the sponsor to the new person. Or you can have both of them.
