Simplify the following text for a Grade 7 native English-speaking person.
Original: The players of this side formed SC Energie Cottbus in 1963 , whilst the reserve team merged back to BSG Aktivist Brieske-Ost to form BSG Aktivist Senftenberg .
Simplified: One squad formed a new team in 1963 SC Energie Cottbus , the reserve team formed BSG Aktivist Senftenberg .