original: Special subscription plans are offered to schools, colleges and libraries; such institutional subscribers constitute an important part of Britannica's business.
simplifications: Special subscription plans are offered to schools, colleges and libraries.  Institutional subscribers make up an important part of Britannica's business. Special plans that are paid ahead of time are offered to schools, colleges, and libraries; these business plans make up an important pat of Britannica's business. There are subscription plans for schools, colleges and libraries. Institutional subscribers are important to Britannica. Special subscription plans are offered to schools, colleges, and libraries. They are a large part of Britannica's business. Schools, colleges and libraries can get special subscription plans. These subscribers make up an important part of Britannica's business. Special subscription plans are offered to schools, colleges and libraries. Such institutional subscribers are an important part of Britannica's business. Subscription plans are offered to schools, colleges and libraries; such subscribers constitute an important part of Britannica's business. Schools and libraries get special subscription plans. These subscribers are an important part of Britannica's business. Special subscription plans are offered to schools, colleges, and libraries. Such subscriptions are an important part of Britannica's business. Special subscription plans are offered to schools, colleges and libraries. These institutional subscribers make up an important part of Britannica's business.