The author states that love is an important aspect to all success; however, we need….

Or, you can make it into two sentences:

The author states that love is an important aspect to all success. However, we need….

Or, you could use another word entirely…would this work:

Although the author states that love is an important aspect to all success, we need….

Hope that helps!

From what you did include, it sounds like you could use the word “Although” to begin the sentence. (However, it is not clear whether the sentence is intended to communicate that “Although the author states x, we need y” or that “The author states that although we need x, we also need y,” or something else altogether.)

Also, as an aside, the word “however” would work if you changed the punctuation, and changed the comma that precedes the word “however” with a semicolon.

Try using a semi colon to seperate two sentences. 😛

You can start a sentence with But, And Unless, With etc. However, some teachers might mark you down for this. Check with your teacher.