Complex sentence: Watson continued to paint for decades although remained largely unknown until the Kirkleatham Museum in Redcar submitted images of his work to the BBC's "Your Painting" website (now Art UK) in 2012 were noticed by Mark Parham who now acts as Watson's curator.
Split into simpler sentences: Watson continued to paint for decades although remained largely unknown until the Kirkleatham Museum in Redcar submitted images of his work to the BBC's "Your Painting" website (now Art UK). In 2012 they were noticed by Mark Parham who now acts as Watson's curator.