Original: The values stored in memory locations labeled 'A' and 'B' are loaded (copied) into the R1 and R2 registers, then added, and the result (which is in register R3) is stored in a memory location labeled 'C'.
Simplified: The values stored in memory locations labeled 'A' and 'B' are loaded (copied) into these registers, then added, and the result is stored in a memory location labeled 'C'.