Simplify the following text for a Grade 7 native English-speaking person.
Original: In the 1950 Presidential election , Kekkonen was chosen as the candidate of the Agrarian Party and conducted a vigorous campaign against the incumbent President Juho Kusti Paasikivi .
Simplified: After Second World War , in the year 1950 Kekkonen became the first time Prime Minister of Finland . He tried to keep good relations with the Soviet Union like president Juho Kusti Paasikivi .