From the order of operations, we do parens, then multiply/divide, then add/subtract, rewriting each step to keep everything clear:
(14) - 2 - (50 ⋅ 2) ⋅ 1 - 1
14 - 2 - 100 ⋅ 1 - 1 [parens are finished]
14 - 2 - 100 - 1 [multiplication is finished]
-- we do the subtraction left to right, but here are the steps:
12 - 100 - 1
-88 - 1
-89
