I just spent some time looking over all the verses in the Bible that use the word Sheol (H7585), and can find no scripture that says it has two parts. Might I ask for the scripture that says this?
I would mention, though, that the word "Sheol" is Hebrew, and
that word is not found in the New Testament texts, so if you are basing your statement only on Luke 16, the text does not say Sheol, but rather "Hades." And a careful reading shows that only the rich man was in Hades. It doesn't
actually say that the beggar was in Hades. The beggar was carried by the angels into Abraham's Bosom, while the rich man found himslef in hell.
(Luke 16:22-23 KJV) And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried; And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
There is no scripture that actually says that Abraham's bosom is in (or is some part of) Hades. It does say that there is a great gulf between Hades and Abraham's Bosom, so ... one might also say that there is a great gulf between Heaven and Hades (hell).
But the reason that one may know Luke 16 is a parable is this verse -
(Psalms 6:5 KJV) For in death there is no remembrance of thee: in Sheol (or hell) who shall give thee thanks?
KIndly,
Rhema