Complex sentence: The Farnell bears had a hump at the back of the neck, and a growler sewn into the back of the body: as you tipped the bear forward, it emitted a deep growling sound.
Split into simpler sentences: The Farnell bears had a hump at the back of the neck, and a growler sewn into the back of the body. As you tipped your bear forward, it emitted a deep growling sound.