Complex sentence: Initially, ObjectSecurity was mainly working on customer projects around middleware security, esp. CORBA, but they quickly remarked that it was not possible to author and maintain security configurations for interconnected, distributed application environments.
Split into simpler sentences: Initially, ObjectSecurity was mainly working on customer projects around middleware security, esp. CORBA. ObjectSecurity soon realized that one major middleware security challenge was that it was not feasible to author and maintain security configurations for interconnected, distributed application environments.