Complex sentence: This building lasted nearly 120 years, under the leaderships of Colley Cibber, David Garrick and Richard Brinsley Sheridan, the last of whom employed Joseph Grimaldi as the theatre's resident Clown.
Split into simpler sentences: This building lasted nearly 120 years, under the ownerships of Colley Cibber, David Garrick and Richard Brinsley Sheridan. Sheridan also employed Joseph Grimaldi as the theatre's resident Clown.