Complex sentence: La Rocque had been playing similar style adventurers in a few of his last silent films, and this film attempts to replicate the success of those silent adventure movies using RCA's early sound equipment, the Photophone system.
Split into simpler sentences: La Rocque had recently been playing similar style adventurers in a few of his last silent films. This film attempts to replicate the success of La Rocque's silent adventure movies using early sound equipment, the Photophone system.