Which contains an independent clause?

because the tragic fumble was scored by the visiting team in the last minute.
when the player, in an extraordinary move, went charging down the field.
as the uproar from the delirious fans exploded jubilantly through the stadium.
while the team made their play, the frenzied crowd cheered them to victory.

While the team made their play, the frenzied crowd cheered them to victory.

This is a good example showing a main clause and it subordinate counterpart. IF let alone, the section underlined stands as a whole sentence and clearly expresses an idea. complies to having its subject, verb, etc. While the section in itallics is complementary, therefore subordinated and dependant to the underlined sentence.

Imagine reading While the team made their play... If let alone, the expression would reflect something is missing, hence an incomplete idea is then solved by adding the second part. ...the frenzied crowd cheered them to victory. Finally we see the ideas forming a whole.

the primary theme of "elegy written in a country churchyard" is a reflection about the significance of the lives of a group of modest people buried in a rural church cemetery. elegies focus on the death of an individual or group of people, and they generally have a melancholy tone. hope this you all.

answer: a lonely woodcutter comes by and decides to chop down the tree, while chopping, connor murphy took a nap next to the tree. waking up from the sound of chopping, he notices the tree falling on him. unable to escape, connor get hit and dies. this was the last of him.