Simplify the following text for a Grade 10 native English-speaking person.
Original: Diana made up a triad with two other Roman deities : Egeria the water nymph , her servant and assistant midwife ; and Virbius , the woodland god .
Simplified: Diana made up a group of three with two other Roman deities : Egeria the water nymph , her servant and midwife helper ; and Virbius , the god of the woods .