<p>Afther the uprising of October 10, 1911, that (has led) to (the establishment of) a Chinese republic, many Chinese Americans decided to return to China (in) hopes of a bright future (there). </p>
<p>(As) children mature, they develop (an independence) that their parents, who (have been) responsible for them since they were born, often find difficult (to accept). </p>
<p>After the uprising of October 10, 1911, that (has led) to (the establishment of) a Chinese republic, many Chinese Americans decided to return to China (in) hopes of a bright future (there). </p>
<p>The tense of led is the problem. The republic is already established so that the present perfect “has led” is incorrect. The past perfect is required: had led.</p>
<p>(As) children mature, they develop (an independence) that their parents, who (have been) responsible for them since they were born, often find difficult (to accept). </p>
<p>This appears correct as written.
(As) : the process of maturing is ongoing
(an independence) : doesn’t seem a wrong use
(have been) : present perfect … the parents are still responsible for them
(to accept) : doesn’t seem a wrong use</p>
<p>When I looked at question 1 I concluded that either the past or the past perfect were correct. My reading of the sentence was that the past perfect was slightly better. I don’t understand why you dismiss that choice. I can construct a handful of examples similar to this one where the past perfect is used in practice. Unfortunately for SAT test takers English grammar is not always black or white. What’s clear though is that the tense in the question is wrong and that’s all that is asked. Perhaps I’m missing something – can you explain?</p>