I saw your selling a bedroom set.
No problem.
Like the following examples:
I think you are happy.
I believe you are clever.
I thought you are intelligent.
I saw you are selling a bedroom set.
I saw you are painting the room.
There is "that" which is omitted after the first verb.
It can be put.
I think that you are happy.
I believe that you are clever.
I thought that you are intelligent.
I saw that you are selling a bedroom set.
I saw that you are painting the room.
I saw you sell/selling a bedroom set.![]()