Complex sentence: He started the firm Sven Hagströmer Fondkommission AB in 1981, which later turned into the commercial bank Hagströmer & Qviberg, publicly known as HQ Bank.
Split into simpler sentences: He started the firm Sven Hagströmer Fondkommission AB in 1981. It later turned into the commercial bank Hagströmer & Qviberg, publicly known as HQ Bank.