Complex sentence: The society's president after 1888, Theodor Billroth, called upon the members to buy shares of the yet-to-be-built society house, and finally, the premises of 662m² were bought for 57.000 guilders.
Split into simpler sentences: The society's president after 1888, The society's president after 1888, Theodor Billroth, called upon the members to buy shares of the yet-to-be-build society house. Finally the premises of 662m² were bought for 57.000 guilders.