というのも

expression

because; the reason is

Used at the beginning of a sentence to explain a reason for a previous statement. Often followed by a clause giving the cause or background.

• 彼かれは来こられない。というのも、急きゅう用ようができたからだ。

  He can't come. The reason is that something urgent came up.

• この店みせは人にん気きがある。というのも、値ね段だんが安やすくて味あじが良よいからだ。

  This restaurant is popular. That's because the prices are low and the food is good.