Complex sentence: In February 2017, Marvel Comics released an image teasing the debut of "Generations", featuring artwork by Alex Ross which depicted a line-up of classic Marvel superheroes with their modern-day counterparts.
Split into simpler sentences: In February 2017, Marvel Comics released an image teasing the debut of "Generations". The image, featuring artwork by Alex Ross, depicted a line-up of classic Marvel superheroes with their modern-day counterparts.