Complex sentence: The time it takes for the kinetic energies of the cluster members to roughly equalize is called the relaxation time of the cluster, which is on the order of 100 million years for a typical globular cluster with radius 10 parsecs consisting of 100 thousand stars.
Split into simpler sentences: The time it takes for the kinetic energies of the cluster members to roughly equalize is called the relaxation time of the cluster. This is on the order of 100 million years for a typical globular cluster with radius 10 parsecs consisting of 100 thousand stars.