Complex sentence: The expansion of the table is continued in this manner until a row containing only one non zero element is reach, at this point, if the first element of the first row of every row pair is positive, the system is stable.
Split into simpler sentences: The expansion of the table is continued in this manner until a row containing only one non zero element is reached. If the first element of the first row of every row pair is positive at this point, then the system is stable.