Corinthians is not part of the old testament so I'm afraid its versing might not be per the union standards.

It is currently versed as:

  Jews demand signs and Greeks search for wisdom.

  But we preach Christ crucified - A stumbling block to Jews and foolishness to Gentiles.

  But to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God.

Which seems like three complete sentences forming a paragraph to me even if not to any modern style guide.

Alternatively it could have been:

  Jews demand signs and Greeks search for wisdom - but we preach [the words of] Christ crucified  !

  A stumbling block to Jews and foolishness to Gentiles.

  But to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God.

In both cases the logical structure remains the same and the three sentences form a larger idea.