Jeremias Wigger (born 10 March 1965) was a Swiss cross country skier who competed from 1988 to 1998. His best finish at the Winter Olympics was fourth in the 4 x 10 km at the 1988 Winter Olympics in Calgary and 13th in the 10 km + 15 km combined pursuit at the 1994 Winter Olympics in Lillehammer.
He was born in 1950 + 15
1950+15 is 1965, the year he was born. I think the model struggles to do addition.
( z1 bear :ARG1 ( z2 he ) :time ( z3 date-interval :op ( z4 date-entity :year 1950 ) :op ( z5 date-entity :year 1955 ) ) )