Complex sentence: The best-known of these group portraits is Rembrandt's "The Nightwatch" "The Nightwatch", completed in 1642, was commissioned by the "klovenier" company under the command of Frans Banning Cocq.
Split into simpler sentences: The best-known of these group portraits is Rembrandt's "The Night Watch". Completed in 1642, it was commissioned by the "klovenier" company under the command of Frans Banning Cocq.