To solve this equation, we must follow the order of operations:

First, calculate what is in parentheses:
28 + 15 = 43

Next, calculate the expression within the second set of parentheses:
345 - 70 = 275

Now, calculate the rest of the expression:
1000 - (43) • 4(275) / 25 • 8

Now, multiply 43 by 4:
43 • 4 = 172

Now, multiply 172 by 275:
172 • 275 = 47300

Now, divide 47300 by 25:
47300 / 25 = 1892

Finally, multiply 1892 by 8:
1892 • 8 = 15136

Therefore, 1000 - 15136 = -14136.

The final answer is -14136.