Complex sentence: As tensions mounted, Israel also made an application to the US in 1955 to purchase 60 M47 tanks and after the US refused, Israel applied again in 1958, this time to purchase 100 M47 tanks but the answer was the same.
Split into simpler sentences: As tensions mounted, Israel also made an application to the US in 1955 to purchase 60 M47 tanks. After the US refused, Israel applied again in 1958, this time to purchase 100 M47 tanks, but the answer was the same.