Complex sentence: Diners Club expanded its customer base in Canada by acquiring the enRoute credit card from Air Canada in 1992, and marketed the card under the combined name for a period of time as the "Diners Club/enRoute Card".
Split into simpler sentences: Diners Club expanded its customer base in Canada by acquiring the enRoute credit card from Air Canada in 1992. It marketed the card under the combined name for a period of time as the "Diners Club/enRoute Card".