Complex sentence: By definition, "x" "g" ("n " + 1) is the first term in this interval, and it follows"x g " ("n ") and"x k" in the sequence.
Split into simpler sentences: By definition, "x" "g" ("n " + 1) is the first term in this interval. Also, it comes after"x g " ("n ") and"x k" in the sequence.