Complex sentence: End Of Greys was a 2006 story arc featured in the Uncanny X-Men comic book series focused mainly on the character of Rachel Summers who was finally reaching out to her deceased mother's relatives.
Split into simpler sentences: End Of Greys was a 2006 story arc featured in the Uncanny X-Men comic book series. The story is focused mainly on the character of Rachel Summers who was finally reaching out to her deceased mother's relatives.