Complex sentence: The N-line is the more populous line, with the greatest number of stallions at stud, it is one of two (the other being the A-line) that has a presence in all Haflinger breeding countries.
Split into simpler sentences: The N-line is the more populous line, with the greatest number of stallions at stud. It is one of two (the other being the A-line) that has a presence in all Haflinger breeding countries.