Complex sentence: In general, it is the case that the instructions of a program are stored in memory at fixed addresses; the instructions of the program do not move as the processor retrieves and executes them, in timely and orderly fashion.
Split into simpler sentences: In general, it is the case that the instructions of a program are stored in memory at fixed addresses. The instructions of the program do not move as the processor retrieves and executes them, in timely and orderly fashion.