Complex sentence: Mascalls Gallery is a public art gallery which opened in 2006 on the site of Mascalls School and originally curated by Nathaniel Hepburn; in 2014 he was replaced by Rebecca Hone.
Split into simpler sentences: Mascalls Gallery is a public art gallery which opened in 2006 on the site of Mascalls School. It was originally curated by Nathaniel Hepburn; in 2014 he was replaced by Rebecca Hone.