Complex sentence: There is a Cloud Provider Interface (CPI) that enables users to extend BOSH to support additional IaaS providers such as Google Compute Engine and Apache CloudStack, VMware vSphere, vCloud Director, Amazon Web Services EC2, and OpenStack.
Split into simpler sentences: There is a Cloud Provider Interface (CPI) that enables users to extend BOSH to support additional IaaS providers such as Google Compute Engine and Apache CloudStack. In addition BOSH supports multiple "Infrastructure as a Service" (IaaS) providers like VMware vSphere, vCloud Director, Amazon Web Services EC2, and OpenStack.