The first paragraph grammar was king of bad, here's a fixed version:
SCP-604 consists of a set of objects; organized for convenience and do to their similar traits and origins. They can be separated from each other without harm. Since guarding the objects separately is a large drain of resource, it is suggested they be maintained together at this time. Due to fact that SCP-604 was retrieved from Marshall, Carter, and Dark Ltd., it requires heavy guarding, with a special focus on infiltration and outside attack. Currently, is is kept at an undisclosed location.