New learners of the Japanese language will probably have difficulty using the 3 types of characters properly
日本語=Japanese
初学者=beginner(初心者), new learners(諸学者)
3種類=3 types
文字=characters, alphabet
使い分ける=use properly(正しく使う), choose(選ぶ)
苦戦する=have difficulty(困る)
だろう=probably
New learners of the Japanese language will probably have difficulty using the 3 types of characters properly
この文をまた日本語に直訳すると「日本語の初学者は多分3種類の文字の正しい使い方に困るだろう」になります。