Original: Epiphany was developed from Galeon by Marco Pesenti Gritti (also the initiator of Galeon) with the aim of making a web browser that would be fully compliant with the GNOME human interface guidelines and that would have a very simple user experience.
Simplified: Epiphany was made from Galeon by Marco Pesenti Gritti (also the creator of Galeon) with the aim of making a web browser with a very simple user experience.