Complex sentence: Illsley has also kept a low-key profile about his own abilities as a musician and songwriter, producing two albums of his own making with Mark Knopfler guesting on his albums and videos on guitar, with Illsley reciprocating on Knopfler's personal projects and charities.
Split into simpler sentences: Illsley has also kept a low-key profile about his own abilities as a musician and songwriter. He produced two albums of his own with Mark Knopfler as a guest musician on his albums, while Illsley helped with Knopfler's personal projects and charities.