Complex sentence: However in Visigoth texts before the 9th century a dot is placed above the line to indicate "m", without a dot meaning "n", the line with dot later became the general mark after the 9th century in Visigoth texts.
Split into simpler sentences: However in Visigoth texts before the 9th century, a dot is placed above the line to indicate "m", without a dot meaning "n". The line with dot later became the general mark after the 9th century in Visigoth texts.