Complex sentence: Around 1051 he had given Spearhafoc, Bishop of London-designate and a monastic goldsmith, gold and jewels with which to make a crown, but after Spearhafoc's election as bishop was not confirmed by the king, he disappeared abroad with the materials.
Split into simpler sentences: Around 1051 he had given Spearhafoc, Bishop of London designate, and a monastic goldsmith, gold and jewels to make a crown. But after Spearhafoc's election as bishop was not confirmed, he disappeared abroad with the materials.