KJV : And <1161> we know <1492> (5758) that <3754> the Son <5207> of God <2316> is come <2240> (5719), and <2532> hath given <1325> (5758) us <2254> an understanding <1271>, that <2443> we may know <1097> (5725) him that is true <228>, and <2532> we are <2070> (5748) in <1722> him that is true <228>, [even] in <1722> his <846> Son <5207> Jesus <2424> Christ <5547>. This <3778> is <2076> (5748) the true <228> God <2316>, and <2532> eternal <166> life <2222>.

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NASB : And we know that the Son of God has come, and has given us understanding so that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life.

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NASB# : And we know<3609> that the Son<5207> of God<2316> has<2240> come<2240>, and has given<1325> us understanding<1271> so<2443> that we may know<1097> Him who<228> is true<228>; and we are in Him who<228> is true<228>, in His Son<5207> Jesus<2424> Christ<5547>. This<3778> is the true<228> God<2316> and eternal<166> life<2222>.