Original: It stood approximately 45 meters (135 ft) in height, and each of the four sides was adorned with sculptural reliefs created by each one of four Greek sculptors - Leochares, Bryaxis, Scopas of Paros and Timotheus.
Simplified: Each of the four sides was decorated with sculptural reliefs created by one of four Greek sculptors - Bryaxis, Leochares, Scopas and Timotheus.