Complex sentence: He was a member of a german aristocratic family living in Portugal, since his grand-father Heinrich Baron von Sommer joined the armies of D.Pedro IV of Portugal, married a portuguese lady and started a company-Casa Sommer & Cia.
Split into simpler sentences: He was a member of a german aristocratic family living in Portugal, since his grand-father Heinrich Baron von Sommer joined the armies of D.Pedro IV of Portugal. He remained in the country, married a portuguese lady and started a company Casa Sommer & Cia.