Complex sentence: The municipality of Maasdam was eventually merged with some surrounding municipalities into the new municipality of Binnenmaas, with the exception of Cillaarshoek which was merged into the existing municipality of Strijen.
Split into simpler sentences: The municipality of Maasdam was eventually merged with some surrounding municipalities to become part of the new municipality of Binnenmaas. The exception was Cillaarshoek which split off and merged into the existing municipality of Strijen.