Can a man b perfectly ok after 3 strokes

My father, now 59yrs old, has had multiple strokes between 2008-2011. The first time, he recovered to full capacity but after the strokes recurred two more times, his physical capacity declined badly. His left side was affected on all the 3 occasions. Now he has problem walking, can't exert too much and is barely able to complete his daily chores. He does attend office and works actively, including going on tours. However, he needs assistance for complex tasks, gets fatigued easily and has trouble comprehending information too complicated or when we speak too much or too fast. He has not been able to drive since the second paralytic stroke. Also, probably as a side effect of the medication so far, he remains low on energy and sometimes depressed. He needs twice as much sleep as a normal person to be able to work. My question is: Is there a treatment today that can bring back his physical capabilities?