Complex sentence: C4, C5 and C4-2 are only minutely distinct from LNCaP and the M subline with the addition of a marker chromosome resulting from a segment addition to chromosome 6.
Split into simpler sentences: C4, C5 and C4-2 are only minutely distinct from LNCaP and the M subline with the addition of a marker chromosome. This additional marker chromosome results from a segment addition to chromosome 6.