If one has thought about something for a while, I think it is better to put that something into action, rather than to keep on thinking about it and wasting one's time.
ご質問ありがとうございます。
"If one has thought about something for a while,"＝「もし何かについてしばらく考えたのであれば」
"I think it is better to put that something into action,"＝「それを行動に移した方が良いと思います」
"rather than to keep on thinking about it and wasting one's time."＝「そのまま考え続けて時間を浪費するよりも。」
ご参考に。
アメリカ合衆国 
