Explanation

“In spite of his efforts he failed.” āĻāχ āĻŦāĻžāĻ•ā§āϝāϟāĻŋāϕ⧇ compound sentence (āϏāĻŽāĻ¨ā§āĻŦāĻŋāϤ āĻŦāĻžāĻ•ā§āϝ) āφāĻ•āĻžāϰ⧇ āϰ⧂āĻĒāĻžāĻ¨ā§āϤāϰ āĻ•āϰāĻžāϰ āϏāĻŽāϝāĻŧ āφāĻŽāĻžāĻĻ⧇āϰ āωāĻĻā§āĻĻ⧇āĻļā§āϝ āĻšāϞ⧋ āĻĻ⧁āϟāĻŋ āĻ¸ā§āĻŦāĻžāϧ⧀āύ clause-āϕ⧇ āĻāĻ•āϟāĻŋ coordinating conjunction āĻĻāĻŋā§Ÿā§‡ āϝ⧁āĻ•ā§āϤ āĻ•āϰāĻžāĨ¤ āĻŽā§‚āϞ āĻŦāĻžāĻ•ā§āϝ⧇ āĻĻ⧁āχāϟāĻŋ āϗ⧁āϰ⧁āĻ¤ā§āĻŦāĻĒā§‚āĻ°ā§āĻŖ āĻ…āĻ‚āĻļ āφāϛ⧇: “he made efforts” āĻāĻŦāĻ‚ “he failed”āĨ¤ āĻāϏāĻŦ clause-āϕ⧇ āύāĻŋāϝāĻŧ⧇ āϝ⧁āĻ•ā§āϤāĻŋ āĻ…āύ⧁āϏāĻžāϰ⧇ contrast āĻŦāĻž āĻŦāĻŋāĻĒāϰ⧀āϤāϤāĻž āĻĒā§āϰāĻ•āĻžāĻļ āĻ•āϰāϤ⧇ āĻšāϞ⧇ coordinating conjunction “but” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻžāχ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻ¸ā§āĻŦāĻžāĻ­āĻžāĻŦāĻŋāĻ• āĻāĻŦāĻ‚ āĻ…āĻ°ā§āĻĨāĻŦāĻšāĨ¤ āϤāĻžāχ “He made efforts but he failed” āϰ⧂āĻĒāĻžāĻ¨ā§āϤāϰāϟāĻŋ āϝāĻĨāĻžāϝāĻĨāĨ¤

āĻĒā§āϰāĻĨāĻŽāϤ, “and” āĻĻāĻŋā§Ÿā§‡ clause-āϗ⧁āϞāĻŋ āϝ⧋āĻ— āĻ•āϰāĻž āĻšāϞ⧇ āĻļ⧁āϧ⧁ āĻĻ⧁āχāϟāĻŋ āĻ•āĻžāĻœā§‡āϰ āĻ•ā§āϰāĻŽ āĻŦāĻž āĻĒāĻžāĻļāĻžāĻĒāĻžāĻļāĻŋ āϘāϟāĻžāϰ āĻŽāĻžāϧ⧁āĻ°ā§āϝ āĻĒā§āϰāĻ•āĻžāĻļ āĻĒāĻžā§Ÿ, āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻāĻ–āĻžāύ⧇ āĻŽā§‚āϞāϤ āĻ­āĻŋāĻ¨ā§āύāĻŽāϤ āĻŦāĻž āĻŦāĻŋāĻĒāϰ⧀āϤ āĻĢāϞāĻžāĻĢāĻ˛â€“ āĻĒā§āϰāĻšā§‡āĻˇā§āϟāĻž āĻĨāĻžāĻ•āĻž āϏāĻ¤ā§āĻ¤ā§āĻŦ⧇āĻ“ āĻŦā§āϝāĻ°ā§āĻĨ āĻšāĻ“ā§ŸāĻžâ€“āĻāϰ āϏāĻŽā§āĻĒāĻ°ā§āĻ• āĻŦ⧁āĻāĻžāϤ⧇ āĻšāĻŦ⧇āĨ¤ second clause-āĻāϰ āĻ…āĻ°ā§āĻĨ first clause-āĻāϰ āĻŦāĻŋāĻĒāϰ⧀āϤ⧇ āĻ…āĻŦāĻ¸ā§āĻĨāĻžāύ āĻ•āϰāϛ⧇āĨ¤ āϤāĻžāχ “and” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϞ⧇ āϤāĻž contrast āĻĢ⧁āϟāĻŦ⧇ āύāĻžāĨ¤

āĻĻā§āĻŦāĻŋāĻ¤ā§€ā§ŸāϤ, “though” āĻĻāĻŋā§Ÿā§‡ āĻļ⧁āϰ⧁ āĻ•āϰāϞ⧇ ⧇āχ āĻŦāĻžāĻ•ā§āϝāϟāĻŋ complex sentence āĻšāĻŦ⧇, āĻ•āĻžāϰāĻŖ “though he made efforts” āĻāĻ•āϟāĻŋ subordinate clause āĻšāĻŋāϏ⧇āĻŦ⧇ āĻ•āĻžāϜ āĻ•āϰāĻŦ⧇āĨ¤ āĻĒā§āϰāĻļā§āύ āĻ¸ā§āĻĒāĻˇā§āϟ āĻ•āϰ⧇ āϚāĻžāχāϛ⧇ compound sentence, āĻ…āĻ°ā§āĻĨāĻžā§Ž āĻĻ⧁āϟāĻŋ āĻ¸ā§āĻŦāĻžāϧ⧀āύ clause āϰāĻžāĻ–āĻž āĻšāĻŦ⧇ āĻāĻŦāĻ‚ coordinating conjunction āĻĻāĻŋā§Ÿā§‡ āϝ⧁āĻ•ā§āϤ āĻ•āϰāĻž āĻšāĻŦ⧇āĨ¤ āϏ⧇āχ āĻĻāĻŋāĻ• āĻĨ⧇āϕ⧇ “though” āĻŽā§āĻ•ā§āϤāĻ•āĻĨāĻžāϰ āĻŦāĻŋāĻĒāϰ⧀āϤ āĻŦā§āϝāĻžā§āϜāύāĻž āϝ⧋āĻ— āĻ•āϰ⧇ āĻŦāϏ⧇ āύāĻžāĨ¤

āϤ⧃āĻ¤ā§€ā§ŸāϤ, “has made efforts” āϞāĻŋāĻ–āϞ⧇ tense consistency āĻ­āĻžāϙ⧇āĨ¤ āĻŽā§‚āϞ āĻŦāĻžāĻ•ā§āϝāϟāĻŋāϤ⧇ āϏāĻžāϧāĻžāϰāĻŖ āĻ…āϤ⧀āϤ “he failed” āωāĻ˛ā§āϞ⧇āĻ– āφāϛ⧇, āϤāĻžāχ āĻĻ⧁āχ āĻ…āĻ‚āĻļ⧇āχ simple past tense āĻĨāĻžāĻ•āĻž āωāϚāĻŋāϤāĨ¤

āĻāχ āϝ⧁āĻ•ā§āϤāĻŋ āĻĨ⧇āϕ⧇ āĻĒāϰāĻŋāĻˇā§āĻ•āĻžāϰ, “He made efforts but he failed” āĻšāϞ āϏāĻŽāĻ¨ā§āĻŦāĻŋāϤ āĻŦāĻžāĻ•ā§āϝ āϝ⧇āϟāĻŋ āĻ…āĻ°ā§āĻĨāĻ—āϤ āĻŦāĻŋāĻĒāϰ⧀āϤāϤāĻž āĻ¸ā§āĻĒāĻˇā§āϟ āĻ•āϰ⧇ āĻāĻŦāĻ‚ grammatically āϏāĻ āĻŋāĻ•āĨ¤

Summary:
- āĻĻ⧁āϟāĻŋ āĻ¸ā§āĻŦāĻžāϧ⧀āύ clause: he made efforts + he failed
- contrast āĻĻ⧇āĻ–āĻžāϤ⧇ “but” āĻŦā§āϝāĻŦāĻšāĻžāϰ
- āϏāĻŽā§Ÿā§‡āϰ āϏāĻ™ā§āĻ—āϤāĻŋ āϰāĻžāĻ–āϤ⧇ simple past tense āϰāĻ•ā§āώāĻž
- āĻĢāϞ⧇ āϏāĻŽāĻ¨ā§āĻŦāĻŋāϤ āĻŦāĻžāĻ•ā§āϝ āĻšā§Ÿ: He made efforts but he failed.