Complex sentence: When Warwick left the band (followed by Laine a few months later), he was briefly replaced by Rod Clark, then Thomas suggested his and Pinder's old bandmate John Lodge as a replacement and also recruited Justin Hayward to replace Laine.
Split into simpler sentences: When Warwick left the band (followed by Laine a few months later) he was briefly replaced by Rod Clark. Thomas then suggested his and Pinder's old bandmate John Lodge as a permanent replacement and also recruited Justin Hayward to replace Laine.