Complex sentence: Atago and Tokyo Metropolitan Route 301, also known as, had been a dense residential neighborhood but recently underwent an urban renewal; it is now known for being home to Atago Green Hills, an urban complex constructed by building tycoon Minoru Mori.
Split into simpler sentences: Atago and Tokyo Metropolitan Route 301, also known as, was a dense residential neighborhood but recently underwent an urban renewal. It is now known as a home to Atago Green Hills, an urban complex constructed by building tycoon Minoru Mori.