Complex sentence: When Bishop Lyfing died in 1046, King Edward the Confessor made Leofric Bishop of Crediton and St. Germans, the two sees united by Lyfing that became the united sees of Devon and Cornwall.
Split into simpler sentences: When Bishop Lyfing died in 1046, King Edward the Confessor made Leofric Bishop of Crediton and St. Germans. The two sees united by Lyfing became the united sees of Devon and Cornwall.