Why do the bedrooms in my home have split switched outlets?
This is a rather easy problem to fix

Modern receptacles have 2 sockets, and a nifty feature -- each side has 2 terminal screws, and a nifty break-off "tab" between them.  Tab in place, the 2 screws are connected so 1 wire can feed both sockets and the second screw can carry power onward to the next socket.  Tab broken off, the 2 screws are separated and the 2 sockets can be controlled individually.  

Typically you break off the "hot" tab, and feed one socket with the red wire, the other with the black wire.  

You could replace with a socket with the tab not broken off.  Connect only the black (typically always-hot) wire, and simply cap off the red wire with a wire-nut (and tape), or if somehow the old socket was used to splice the supply and onward red wires, join them with a wire nut.  

Tenant law prohibits you doing the work yourself without permission. 

Landlord law requires them to hire a licensed electrician for any work done in the rental unit.  Residential law requires you to "pull a permit" for any substantial electrical work, but excluded from that is trivial work such as  "changing a receptacle".  So check with your permit issuing authority, but it's likely that merely changing a receptacle is something a licensed electrician is not needed for.  Tell them you want to do it for aesthetic reasons, don't go so far as mentioning the desired change in function.