perl -lne '/Sentences/ and ++$f or $f and print' FILE

Or just '/Sentences/ and ++$f; $f and print' to print both heading and lines.

With a more idiomatic scalar context range op version of the latter being
'print if /THIS-IS-NOT-MY-HOMEWORK-AFTER-THE-Sentences/ .. (0 and "or is it?")'.

:>

In reply to Re: Reading lines from a specific location in a text file. by jakobi
in thread Reading lines from a specific location in a text file. by peokai

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