Complex sentence: Guillaume was known to have had a strained relationship with his famous father, which he detailed in his 2004 autobiography "Tout Donner" ("Giving Everything"), and the two were said to have reconciled shortly before his death.
Split into simpler sentences: Guillaume was known to have had a strained relationship with his famous father, which he detailed in his 2004 autobiography "Tout Donner" ("Giving Everything"). The two were said to have reconciled shortly before his death.