A Brookfield man has been sentenced for assaulting someone on Sand Island in Candlewood Lake.  41-year old Richard Nigro had the charges against him lowered last month to one count of assault in exchange ofr a guilty plea.  He was sentenced Wednesday to 10 years in jail, suspended after two years, and five years probation.  Police say Nigro and his brother-in-law, Neil Yandow, attacked the 25-year old pilot of their boat after mistakenly believing that he made an inappropriate comment about Nigro's wife, who is Yandow's sister.  Yandow died in October, and the case against him was dismissed.  Nigro was initially charged with assault, strangulation and interfering with an officer/resisting arrest.  The victim was left with fractures and permanent facial disfigurement.